1
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Bukhari SSAS, Halder A, Lindinger A. Polarization enhanced two-photon excited fluorescence contrast by shaped laser pulses using a deformable phase plate. APPLIED OPTICS 2023; 62:8242-8247. [PMID: 38037926 DOI: 10.1364/ao.503531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/05/2023] [Indexed: 12/02/2023]
Abstract
We utilize spatially and temporally tailored laser pulses for polarization enhanced two-photon excited fluorescence contrasts of dyes. The shaped laser pulses are produced by first passing through a temporal pulse shaper and then through a two-dimensional spatial pulse shaper with deformable phase plates. Different spatial beam profiles are presented that demonstrate the potential of the spatial pulse shaper. Particularly, a polarization enhanced fluorescence contrast between two dyes is reported by utilizing specific phase shaping in perpendicular polarization directions. The tailored laser pulses are further modified by the deformable phase plate, and a polarization increased depth-dependent contrast is achieved. This spatial shaping for all polarization directions demonstrates the advantage of deformable phase plate spatial shapers compared to liquid crystals, where only one polarization direction can spatially be modified. The described polarization contrast method allows for three-dimensional scanning of probes and provides perspectives for biophotonic applications.
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2
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Aerts A, Jolly SW, Kockaert P, Gorza SP, Auwera JV, Vaeck N. Modulated super-Gaussian laser pulse to populate a dark rovibrational state of acetylene. J Chem Phys 2023; 159:084303. [PMID: 37638622 DOI: 10.1063/5.0160526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 08/10/2023] [Indexed: 08/29/2023] Open
Abstract
A pulse-shaping technique in the mid-infrared spectral range based on pulses with a super-Gaussian temporal profile is considered for laser control. We show a realistic and efficient path to the population of a dark rovibrational state in acetylene (C2H2). The laser-induced dynamics in C2H2 are simulated using fully experimental structural parameters. Indeed, the rotation-vibration energy structure, including anharmonicities, is defined by the global spectroscopic Hamiltonian for the ground electronic state of C2H2 built from the extensive high-resolution spectroscopy studies on the molecule, transition dipole moments from intensities, and the effects of the (inelastic) collisions that are parameterized from line broadenings using the relaxation matrix [A. Aerts, J. Vander Auwera, and N. Vaeck, J. Chem. Phys. 154, 144308 (2021)]. The approach, based on an effective Hamiltonian, outperforms today's ab initio computations both in terms of accuracy and computational cost for this class of molecules. With such accuracy, the Hamiltonian permits studying the inner mechanism of theoretical pulse shaping [A. Aerts et al., J. Chem. Phys. 156, 084302 (2022)] for laser quantum control. Here, the generated control pulse presents a number of interferences that take advantage of the control mechanism to populate the dark state. An experimental setup is proposed for in-laboratory investigation.
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Affiliation(s)
- Antoine Aerts
- Université Libre de Bruxelles, Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), 50 Avenue F. Roosevelt, C.P. 160/09, Brussels 1050, Belgium
| | - Spencer W Jolly
- Université Libre de Bruxelles, OPERA-Photonique, 50 Avenue F. Roosevelt, C.P. 194/05, Brussels 1050, Belgium
| | - Pascal Kockaert
- Université Libre de Bruxelles, OPERA-Photonique, 50 Avenue F. Roosevelt, C.P. 194/05, Brussels 1050, Belgium
| | - Simon-Pierre Gorza
- Université Libre de Bruxelles, OPERA-Photonique, 50 Avenue F. Roosevelt, C.P. 194/05, Brussels 1050, Belgium
| | - Jean Vander Auwera
- Université Libre de Bruxelles, Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), 50 Avenue F. Roosevelt, C.P. 160/09, Brussels 1050, Belgium
| | - Nathalie Vaeck
- Université Libre de Bruxelles, Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), 50 Avenue F. Roosevelt, C.P. 160/09, Brussels 1050, Belgium
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3
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Gottschalk R, Lindinger A. Temporally shaped vortex phase laser pulses for two-photon excited fluorescence. APPLIED OPTICS 2022; 61:10207-10213. [PMID: 36606782 DOI: 10.1364/ao.473744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 11/04/2022] [Indexed: 06/17/2023]
Abstract
We report temporally shaped vortex phase laser pulses for two-photon excited fluorescence of dyes. The particularly tailored pulses are generated by first utilizing a temporal pulse shaper and subsequently a two-dimensional spatial pulse shaper. Various vortex phase shaped structures are demonstrated by combining different two-dimensional phase patterns. Moreover, perpendicular polarization components are used to achieve an enhanced radial two-photon excited fluorescence contrast by applying third order phase functions on the temporal pulse shaper. Particularly, the spatial fluorescence structure is modulated with a combination of Gaussian and vortex phase shaped pulses by modifying only the phase on the temporal modulator. Thereby, interference structures with high spatial resolution arise. The introduced method to generate temporally shaped vortex phase tailored pulses will provide new perspectives for biophotonic applications.
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4
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Aerts A, Kockaert P, Gorza SP, Brown A, Vander Auwera J, Vaeck N. Laser control of a dark vibrational state of acetylene in the gas phase—Fourier transform pulse shaping constraints and effects of decoherence. J Chem Phys 2022; 156:084302. [DOI: 10.1063/5.0080332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
We propose a methodology to tackle the laser control of a non-stationary dark ro-vibrational state of acetylene (C2H2), given realistic experimental limitations in the 7.7 μm (1300 cm−1) region. Simulations are performed using the Lindblad master equation, where the so-called Lindblad parameters are used to describe the effect of the environment in the dilute gas phase. A phenomenological representation of the parameters is used, and they are extracted from high-resolution spectroscopy line broadening data. An effective Hamiltonian is used for the description of the system down to the rotational level close to experimental accuracy. The quality of both the Hamiltonian and Lindblad parameters is assessed by a comparison of a calculated infrared spectrum with the available experimental data. A single shaped laser pulse is used to perform the control, where elements of optics and pulse shaping using masks are introduced with emphasis on experimental limitations. The optimization procedure, based on gradients, explicitly takes into account the experimental constraints. Control performances are reported for shaping masks of increasing complexity. Although modest performances are obtained, mainly due to the strong pulse shaping constraints, we gain insights into the control mechanism. This work is the first step toward the conception of a realistic experiment that will allow for population characterization and manipulation of a non-stationary vibrational “dark” state. Effects of the collisions on the laser control in the dilute gas phase, leading to decoherence in the molecular system, are clearly shown.
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Affiliation(s)
- Antoine Aerts
- Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université Libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 160/09, B-1050 Brussels, Belgium
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Pascal Kockaert
- OPERA-Photonique, Université Libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 194/05, B-1050 Brussels, Belgium
| | - Simon-Pierre Gorza
- OPERA-Photonique, Université Libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 194/05, B-1050 Brussels, Belgium
| | - Alex Brown
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Jean Vander Auwera
- Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université Libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 160/09, B-1050 Brussels, Belgium
| | - Nathalie Vaeck
- Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université Libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 160/09, B-1050 Brussels, Belgium
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5
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Keefer D, Rouxel JR, Aleotti F, Segatta F, Garavelli M, Mukamel S. Diffractive Imaging of Conical Intersections Amplified by Resonant Infrared Fields. J Am Chem Soc 2021; 143:13806-13815. [PMID: 34402612 DOI: 10.1021/jacs.1c06068] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The fate of virtually all photochemical reactions is determined by conical intersections. These are energetically degenerate regions of molecular potential energy surfaces that strongly couple electronic states, thereby enabling fast relaxation channels. Their direct spectroscopic detection relies on weak features that are often buried beneath stronger, less interesting contributions. For azobenzene photoisomerization, a textbook photochemical reaction, we demonstrate how a resonant infrared field can be employed during the conical intersection passage to significantly enhance its coherence signatures in time-resolved X-ray diffraction while leaving the product yield intact. This transition-state amplification holds promise to bring signals of conical intersections above the detection threshold.
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Affiliation(s)
- Daniel Keefer
- Departments of Chemistry and Physics & Astronomy, University of California, Irvine, California 92697-2025, United States
| | - Jérémy R Rouxel
- University Lyon, UJM-Saint-Étienne, CNRS, Graduate School Optics Institute, Laboratoire Hubert Curien UMR 5516, Saint-Étienne 42023, France
| | - Flavia Aleotti
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Francesco Segatta
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Marco Garavelli
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Shaul Mukamel
- Departments of Chemistry and Physics & Astronomy, University of California, Irvine, California 92697-2025, United States
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6
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Keefer D, Mukamel S. Selective Enhancement of Spectroscopic Features by Quantum Optimal Control. PHYSICAL REVIEW LETTERS 2021; 126:163202. [PMID: 33961451 DOI: 10.1103/physrevlett.126.163202] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/12/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
Tailored light can be used to steer atomic motions into selected quantum pathways. In optimal control theory (OCT), the target is usually expressed in terms of the molecular wave function, a quantity that is not directly observable in experiment. We present simulations using OCT that optimize the spectroscopic signal itself. By shaping the optical pump, the x-ray stimulated Raman signal, which occurs solely during the passage through conical intersections, is temporally controlled and amplified by up to 2 orders of magnitude. This enhancement can be crucial in order to bring small coherence-based signatures above the detectable threshold. Our approach is applicable to any signal that depends on the expectation value of a positive definite operator.
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Affiliation(s)
- Daniel Keefer
- Departments of Chemistry and Physics and Astronomy, University of California, Irvine, California 92697-2025, USA
| | - Shaul Mukamel
- Departments of Chemistry and Physics and Astronomy, University of California, Irvine, California 92697-2025, USA
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7
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Ma F. Dynamics and Coherent Control of Exciton–Exciton Annihilation in Aqueous J-Aggregate. J Phys Chem B 2018; 122:10746-10753. [DOI: 10.1021/acs.jpcb.8b09891] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fei Ma
- Division of Chemical Physics, Department of Chemistry, Lund University, 221 00 Lund, Sweden
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8
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Abstract
In 1998, the first successful quantum control experiment with application to a molecular framework was conducted with a shaped laser pulse, optimizing the branching ratio between different organometallic reaction channels. This work induced a vast activity in quantum control during the next 10 years, and different optimization aims were achieved in the gas phase, liquid phase, and even in biologically relevant molecules like light-harvesting complexes. Accompanying and preceding this development were important advances in theoretical quantum control simulations. They predicted several control scenarios and explained how and why quantum control experiments work. After many successful proofs of concept in molecular science, the big challenge is to expand its huge conceptual potential of directly being able to steer nuclear and/or electronic motion to more applied implementations. In this Account, based on several recent advances, we give a personal evaluation of where the field of molecular quantum control is at the moment and especially where we think promising applications can be in the near future. One of these paths leads to synthetic chemistry. The synthesis of novel pharmaceutical compounds or natural products often involves many synthetic steps, each one devouring resources and lowering the product yield. Shaped laser pulses can possibly act as photonic reagents and shorten the synthetic route toward the desired product. Chemical synthesis usually takes place in solution, and by including explicit solvent molecules in our quantum control simulations, we were able to identify their highly inhomogeneous influence on chemical reactions and how this affects potential quantum control. More important, we demonstrated for a synthetically relevant example that these complications can be overcome in theory, and laser pulses can be optimized to initiate the desired carbon-carbon bond formation. Putting this into context with the recently emerging concept of flow chemistry, which brings several practical advantages to the application of laser pulses, we want to encourage experimental groups to exploit this concept. Another path was opened by several additions to the commonly used laser pulse optimization algorithm (optimal control theory, OCT), several of which were developed in our group. The OCT algorithm as such is a purely mathematical optimization procedure, with no direct relation to experimental requirements. This means that usually the electric fields obtained out of OCT optimizations do not resemble laser pulses that can be achieved experimentally. However, the previously mentioned additions are aimed at closing the gap toward the experiment. In a recent quantum control study of our group, these algorithmic developments came to fruition. We were able to suggest a shaped laser pulse which can induce a long-living wave packet in the excited state of uracil. This might pave the way for novel experiments dedicated to investigating the formation of biological photodamage in DNA and RNA. The pulse we suggest is surprisingly simple because of the extended OCT algorithm and fulfills all criteria to be experimentally accessible.
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Affiliation(s)
- Daniel Keefer
- Department Chemie, Ludwig-Maximilians-Universität München, D-81377 München, Germany
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9
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Grimmelsmann L, Schuabb V, Tekin B, Winter R, Nuernberger P. Impact of kilobar pressures on ultrafast triazene and thiacyanine photodynamics. Phys Chem Chem Phys 2018; 20:18169-18175. [DOI: 10.1039/c8cp03334j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Application of high hydrostatic pressure leads to changes in (sub)picosecond emission dynamics, depending on the mechanism at work for the photoreaction.
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Affiliation(s)
| | - Vitor Schuabb
- Physikalische Chemie I – Biophysikalische Chemie
- Technische Universität Dortmund
- 44227 Dortmund
- Germany
| | - Beritan Tekin
- Physikalische Chemie II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Roland Winter
- Physikalische Chemie I – Biophysikalische Chemie
- Technische Universität Dortmund
- 44227 Dortmund
- Germany
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10
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Chang BY, Shin S, Engel V, Sola IR. Geometrical Optimization Approach to Isomerization: Models and Limitations. J Phys Chem A 2017; 121:8280-8287. [DOI: 10.1021/acs.jpca.7b08767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bo Y. Chang
- School
of Chemistry (BK21), Seoul National University, Seoul 08826, Republic of Korea
| | - Seokmin Shin
- School
of Chemistry (BK21), Seoul National University, Seoul 08826, Republic of Korea
| | - Volker Engel
- Institut
für Physikalische und Theoretische Chemie, Universität Würzburg, 97074 Würzburg, Germany
| | - Ignacio R. Sola
- Departamento
de Química Física I, Universidad Complutense, 28040 Madrid, Spain
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11
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Thomas EF, Henriksen NE. Phase-Modulated Nonresonant Laser Pulses Can Selectively Convert Enantiomers in a Racemic Mixture. J Phys Chem Lett 2017; 8:2212-2219. [PMID: 28467085 DOI: 10.1021/acs.jpclett.7b00662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Deracemization occurs when a racemic molecular mixture is transformed into a mixture containing an excess of a single enantiomer. Recent advances in ultrafast laser technology hint at the possibility of using shaped pulses to generate deracemization via selective enantiomeric conversion; however, experimental implementation remains a challenge and has not yet been achieved. Here we suggest a simple, yet novel approach to laser-induced enantiomeric conversion based on dynamic Stark control. We demonstrate theoretically that current laser and optical technology can be used to generate a pair of phase-modulated, nonresonant, linearly polarized Gaussian laser pulses that can selectively deracemize a racemic mixture of 3D-oriented, 3,5-difluoro-3',5'-dibromobiphenyl (F2H3C6-C6H3Br2) molecules, the laser-induced dynamics of which are well studied experimentally. These results strongly suggest that designing a closed-loop coherent control scheme based on this methodology may lead to the first-ever achievement of enantiomeric conversion via coherent laser light in a laboratory setting.
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Affiliation(s)
- Esben F Thomas
- Department of Chemistry, Technical University of Denmark , Building 206, DK-2800 Kongens Lyngby, Denmark
| | - Niels E Henriksen
- Department of Chemistry, Technical University of Denmark , Building 206, DK-2800 Kongens Lyngby, Denmark
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12
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Kumpulainen T, Lang B, Rosspeintner A, Vauthey E. Ultrafast Elementary Photochemical Processes of Organic Molecules in Liquid Solution. Chem Rev 2016; 117:10826-10939. [DOI: 10.1021/acs.chemrev.6b00491] [Citation(s) in RCA: 249] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tatu Kumpulainen
- Department of Physical Chemistry,
Sciences II, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - Bernhard Lang
- Department of Physical Chemistry,
Sciences II, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - Arnulf Rosspeintner
- Department of Physical Chemistry,
Sciences II, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - Eric Vauthey
- Department of Physical Chemistry,
Sciences II, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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13
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Thomas EF, Henriksen NE. Non-resonant dynamic stark control of vibrational motion with optimized laser pulses. J Chem Phys 2016; 144:244307. [PMID: 27369515 DOI: 10.1063/1.4954663] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The term dynamic Stark control (DSC) has been used to describe methods of quantum control related to the dynamic Stark effect, i.e., a time-dependent distortion of energy levels. Here, we employ analytical models that present clear and concise interpretations of the principles behind DSC. Within a linearly forced harmonic oscillator model of vibrational excitation, we show how the vibrational amplitude is related to the pulse envelope, and independent of the carrier frequency of the laser pulse, in the DSC regime. Furthermore, we shed light on the DSC regarding the construction of optimal pulse envelopes - from a time-domain as well as a frequency-domain perspective. Finally, in a numerical study beyond the linearly forced harmonic oscillator model, we show that a pulse envelope can be constructed such that a vibrational excitation into a specific excited vibrational eigenstate is accomplished. The pulse envelope is constructed such that high intensities are avoided in order to eliminate the process of ionization.
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Affiliation(s)
- Esben F Thomas
- Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark
| | - Niels E Henriksen
- Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark
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14
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Nairat M, Konar A, Lozovoy VV, Beck WF, Blanchard GJ, Dantus M. Controlling S2 Population in Cyanine Dyes Using Shaped Femtosecond Pulses. J Phys Chem A 2016; 120:1876-85. [PMID: 26935762 DOI: 10.1021/acs.jpca.6b01835] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fast population transfer from higher to lower excited states occurs via internal conversion (IC) and is the basis of Kasha's rule, which states that spontaneous emission takes place from the lowest excited state of the same multiplicity. Photonic control over IC is of interest because it would allow direct influence over intramolecular nonradiative decay processes occurring in condensed phase. Here we tracked the S2 and S1 fluorescence yield for different cyanine dyes in solution as a function of linear chirp. For the cyanine dyes with polar solvation response IR144 and meso-piperidine substituted IR806, increased S2 emission was observed when using transform limited pulses, whereas chirped pulses led to increased S1 emission. The nonpolar solvated cyanine IR806, on the other hand, did not show S2 emission. A theoretical model, based on a nonperturbative solution of the equation of motion for the density matrix, is offered to explain and simulate the anomalous chirp dependence. Our findings, which depend on pulse properties beyond peak intensity, offer a photonic method to control S2 population thereby opening the door for the exploration of photochemical processes initiated from higher excited states.
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Affiliation(s)
- Muath Nairat
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Arkaprabha Konar
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Vadim V Lozovoy
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Warren F Beck
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - G J Blanchard
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Marcos Dantus
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States.,Department of Physics and Astronomy, Michigan State University , East Lansing, Michigan 48824, United States
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15
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Tiwari AK, Henriksen NE. Phase-only laser control in the weak-field limit: Two-pulse control of IBr photofragmentation revisited. J Chem Phys 2016; 144:014306. [DOI: 10.1063/1.4939247] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Ma F, Yartsev A. Ultrafast photoisomerization of pinacyanol: watching an excited state reaction transiting from barrier to barrierless forms. RSC Adv 2016. [DOI: 10.1039/c6ra03299k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Photoisomerization of 1,1′-diethyl-2,2′-carbocyanine iodide (pinacyanol) in alcohols was investigated by means of femtosecond time-resolved absorption spectroscopy.
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Affiliation(s)
- Fei Ma
- Chemical Physics
- Department of Chemistry
- Lund University
- Lund
- Sweden
| | - Arkady Yartsev
- Chemical Physics
- Department of Chemistry
- Lund University
- Lund
- Sweden
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17
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Mathur D, Dota K, Dey D, Tiwari AK, Dharmadhikari JA, Dharmadhikari AK, De S, Vasa P. Selective breaking of bonds in water with intense, 2-cycle, infrared laser pulses. J Chem Phys 2015; 143:244310. [PMID: 26723674 DOI: 10.1063/1.4938500] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
One of the holy grails of contemporary science has been to establish the possibility of preferentially breaking one of several bonds in a molecule. For instance, the two O-H bonds in water are equivalent: given sufficient energy, either one of them is equally likely to break. We report bond-selective molecular fragmentation upon application of intense, 2-cycle pulses of 800 nm laser light: we demonstrate up to three-fold enhancement for preferential bond breaking in isotopically substituted water (HOD). Our experimental observations are rationalized by means of ab initio computations of the potential energy surfaces of HOD, HOD(+), and HOD(2+) and explorations of the dissociation limits resulting from either O-H or O-D bond rupture. The observations we report present a formidable theoretical challenge that need to be taken up in order to gain insights into molecular dynamics, strong field physics, chemical physics, non-adiabatic processes, mass spectrometry, and time-dependent quantum chemistry.
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Affiliation(s)
- D Mathur
- Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005, India
| | - K Dota
- Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005, India
| | - D Dey
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - A K Tiwari
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - J A Dharmadhikari
- Centre for Atomic and Molecular Physics, Manipal University, Manipal 576 104, India
| | - A K Dharmadhikari
- Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005, India
| | - S De
- Saha Institute of Nuclear Physics, Bidhan Nagar, Kolkata 700 064, India
| | - P Vasa
- Department of Physics, Indian Institute of Technology Bombay, Mumbai 400 076, India
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18
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Curchod BFE, Penfold TJ, Rothlisberger U, Tavernelli I. Local Control Theory in Trajectory Surface Hopping Dynamics Applied to the Excited-State Proton Transfer of 4-Hydroxyacridine. Chemphyschem 2015; 16:2127-33. [PMID: 26036986 DOI: 10.1002/cphc.201500190] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Indexed: 11/08/2022]
Abstract
The application of local control theory combined with nonadiabatic ab initio molecular dynamics to study the photoinduced intramolecular proton transfer reaction in 4-hydroxyacridine was investigated. All calculations were performed within the framework of linear-response time-dependent density functional theory. The computed pulses revealed important information about the underlying excited-state nuclear dynamics highlighting the involvement of collective vibrational modes that would normally be neglected in a study performed on model systems constrained to a subset of the full configuration space. This study emphasizes the strengths of local control theory for the design of pulses that can trigger chemical reactions associated with the population of a given molecular excited state. In addition, analysis of the generated pulses can help to shed new light on the photophysics and photochemistry of complex molecular systems.
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Affiliation(s)
- Basile F E Curchod
- Laboratory of Computational Chemistry and Biochemistry, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland).,Current address: Department of Chemistry, Stanford University, Stanford, California 94305 (USA)
| | | | - Ursula Rothlisberger
- Laboratory of Computational Chemistry and Biochemistry, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland)
| | - Ivano Tavernelli
- Laboratory of Computational Chemistry and Biochemistry, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland). .,Current address: IBM Research GmbH, Zurich Research Laboratory, 8803 Rüschlikon (Switzerland).
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19
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Solá IR, González-Vázquez J, de Nalda R, Bañares L. Strong field laser control of photochemistry. Phys Chem Chem Phys 2015; 17:13183-200. [PMID: 25835746 DOI: 10.1039/c5cp00627a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strong ultrashort laser pulses have opened new avenues for the manipulation of photochemical processes like photoisomerization or photodissociation. The presence of light intense enough to reshape the potential energy surfaces may steer the dynamics of both electrons and nuclei in new directions. A controlled laser pulse, precisely defined in terms of spectrum, time and intensity, is the essential tool in this type of approach to control chemical dynamics at a microscopic level. In this Perspective we examine the current strategies developed to achieve control of chemical processes with strong laser fields, as well as recent experimental advances that demonstrate that properties like the molecular absorption spectrum, the state lifetimes, the quantum yields and the velocity distributions in photodissociation processes can be controlled by the introduction of carefully designed strong laser fields.
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Affiliation(s)
- Ignacio R Solá
- Departamento de Química Física I (Unidad Asociada de I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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Upadhyayula S, Nuñez V, Espinoza EM, Larsen JM, Bao D, Shi D, Mac JT, Anvari B, Vullev VI. Photoinduced dynamics of a cyanine dye: parallel pathways of non-radiative deactivation involving multiple excited-state twisted transients. Chem Sci 2015; 6:2237-2251. [PMID: 29449923 PMCID: PMC5701728 DOI: 10.1039/c4sc02881c] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 02/09/2015] [Indexed: 12/11/2022] Open
Abstract
Cyanine dyes are broadly used for fluorescence imaging and other photonic applications. 3,3'-Diethylthiacyanine (THIA) is a cyanine dye composed of two identical aromatic heterocyclic moieties linked with a single methine, -CH[double bond, length as m-dash]. The torsional degrees of freedom around the methine bonds provide routes for non-radiative decay, responsible for the inherently low fluorescence quantum yields. Using transient absorption spectroscopy, we determined that upon photoexcitation, the excited state relaxes along two parallel pathways producing three excited-state transients that undergo internal conversion to the ground state. The media viscosity impedes the molecular modes of ring rotation and preferentially affects one of the pathways of non-radiative decay, exerting a dominant effect on the emission properties of THIA. Concurrently, the polarity affects the energy of the transients involved in the decay pathways and further modulates the kinetics of non-radiative deactivation.
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Affiliation(s)
- Srigokul Upadhyayula
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
- Department of Biochemistry , University of California , Riverside , CA 92521 , USA
| | - Vicente Nuñez
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
| | - Eli M Espinoza
- Department of Chemistry , University of California , Riverside , CA 92521 , USA
| | - Jillian M Larsen
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
| | - Duoduo Bao
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
| | - Dewen Shi
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
| | - Jenny T Mac
- Department of Biochemistry , University of California , Riverside , CA 92521 , USA
| | - Bahman Anvari
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
| | - Valentine I Vullev
- Department of Bioengineering , University of California , Riverside , CA 92521 , USA .
- Department of Biochemistry , University of California , Riverside , CA 92521 , USA
- Department of Chemistry , University of California , Riverside , CA 92521 , USA
- Materials Science and Engineering Program , University of California , Riverside , CA 92521 , USA
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García-Vela A, Henriksen NE. Coherent Control of Photofragment Distributions Using Laser Phase Modulation in the Weak-Field Limit. J Phys Chem Lett 2015; 6:824-829. [PMID: 26262659 DOI: 10.1021/acs.jpclett.5b00129] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The possibility of quantum interference control of the final state distributions of photodissociation fragments by means of pure phase modulation of the pump laser pulse in the weak-field regime is demonstrated theoretically for the first time. The specific application involves realistic wave packet calculations of the transient vibrational populations of the Br2(B, v(f)) fragment produced upon predissociation of the Ne-Br2(B) complex, which is excited to a superposition of resonance states using pulses with different linear chirps. Transient phase effects on the fragment populations are found to persist for long times (about 200 ps) after the pulse is over due to interference between overlapping resonances in Ne-Br2(B).
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Affiliation(s)
- Alberto García-Vela
- †Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain
| | - Niels E Henriksen
- ‡Department of Chemistry, Building 207, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
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Chenel A, Meier C, Dive G, Desouter-Lecomte M. Optimal control of a Cope rearrangement by coupling the reaction path to a dissipative bath or a second active mode. J Chem Phys 2015; 142:024307. [DOI: 10.1063/1.4905200] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Tiwari AK, Henriksen NE. Pulse-train control of photofragmentation at constant field energy. J Chem Phys 2014; 141:204301. [PMID: 25429936 DOI: 10.1063/1.4902061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We consider a phaselocked two-pulse sequence applied to photofragmentation in the weak-field limit. The two pulses are not overlapping in time, i.e., the energy of the pulse-train is constant for all time delays. It is shown that the relative yield of excited Br (*) in the nonadiabatic process: I + Br* ← IBr → I + Br, changes as a function of time delay when the two excited wave packets interfere. The underlying mechanisms are analyzed and the change in the branching ratio as a function of time delay is only a reflection of a changing frequency distribution of the pulse train; the branching ratio does not depend on the detailed pulse shape.
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Affiliation(s)
- Ashwani K Tiwari
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741 252, India
| | - Niels E Henriksen
- Department of Chemistry, Building 207, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
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Moore Tibbetts K, Xing X, Rabitz H. Laboratory transferability of optimally shaped laser pulses for quantum control. J Chem Phys 2014; 140:074302. [PMID: 24559348 DOI: 10.1063/1.4863137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Optimal control experiments can readily identify effective shaped laser pulses, or "photonic reagents," that achieve a wide variety of objectives. An important additional practical desire is for photonic reagent prescriptions to produce good, if not optimal, objective yields when transferred to a different system or laboratory. Building on general experience in chemistry, the hope is that transferred photonic reagent prescriptions may remain functional even though all features of a shaped pulse profile at the sample typically cannot be reproduced exactly. As a specific example, we assess the potential for transferring optimal photonic reagents for the objective of optimizing a ratio of photoproduct ions from a family of halomethanes through three related experiments. First, applying the same set of photonic reagents with systematically varying second- and third-order chirp on both laser systems generated similar shapes of the associated control landscape (i.e., relation between the objective yield and the variables describing the photonic reagents). Second, optimal photonic reagents obtained from the first laser system were found to still produce near optimal yields on the second laser system. Third, transferring a collection of photonic reagents optimized on the first laser system to the second laser system reproduced systematic trends in photoproduct yields upon interaction with the homologous chemical family. These three transfers of photonic reagents are demonstrated to be successful upon paying reasonable attention to overall laser system characteristics. The ability to transfer photonic reagents from one laser system to another is analogous to well-established utilitarian operating procedures with traditional chemical reagents. The practical implications of the present results for experimental quantum control are discussed.
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Affiliation(s)
| | - Xi Xing
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Herschel Rabitz
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
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Moore Tibbetts K, Xing X, Rabitz H. Exploring control landscapes for laser-driven molecular fragmentation. J Chem Phys 2013; 139:144201. [DOI: 10.1063/1.4824153] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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García-Vela A. Selective coherent control of the lifetime of a resonance state with laser pulses. J Chem Phys 2013; 139:134306. [PMID: 24116567 DOI: 10.1063/1.4823983] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
It is shown that new possibilities for control of the lifetime of a system in a resonance state emerge when the density of resonances overlapping and interfering with the target resonance increases. When using a control scheme combining two pump laser pulses, it is found that increasing the density of resonance states overlapping with the target one increases the selectivity of the scheme applied, and leads to achieve a remarkably higher degree of control. Lifetime enhancements by factors up to 20 are obtained when this selectivity is applied. The underlying reasons for such strong enhancements are analyzed and explained in the light of the equations of the model applied. Application of this strategy to control and enhance the lifetime of a system in excited states is envisioned.
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Affiliation(s)
- A García-Vela
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain
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28
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Arasaki Y, Takatsuka K. Pulse-Train Photoelectron Spectroscopy of Electronic and Nuclear Dynamics in Molecules. Chemphyschem 2013; 14:1387-96. [DOI: 10.1002/cphc.201201094] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 03/06/2013] [Indexed: 11/06/2022]
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31
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Fuyuki M, Furuta K, Wada A. Vibronic relaxation dynamics at intermediate state of two-pump excitation: Photoisomerization of indocyanine green in ethanol. RSC Adv 2013. [DOI: 10.1039/c3ra40753e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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32
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von den Hoff P, Thallmair S, Kowalewski M, Siemering R, de Vivie-Riedle R. Optimal control theory--closing the gap between theory and experiment. Phys Chem Chem Phys 2012; 14:14460-85. [PMID: 23019574 DOI: 10.1039/c2cp41838j] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Optimal control theory and optimal control experiments are state-of-the-art tools to control quantum systems. Both methods have been demonstrated successfully for numerous applications in molecular physics, chemistry and biology. Modulated light pulses could be realized, driving these various control processes. Next to the control efficiency, a key issue is the understanding of the control mechanism. An obvious way is to seek support from theory. However, the underlying search strategies in theory and experiment towards the optimal laser field differ. While the optimal control theory operates in the time domain, optimal control experiments optimize the laser fields in the frequency domain. This also implies that both search procedures experience a different bias and follow different pathways on the search landscape. In this perspective we review our recent developments in optimal control theory and their applications. Especially, we focus on approaches, which close the gap between theory and experiment. To this extent we followed two ways. One uses sophisticated optimization algorithms, which enhance the capabilities of optimal control experiments. The other is to extend and modify the optimal control theory formalism in order to mimic the experimental conditions.
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Affiliation(s)
- Philipp von den Hoff
- Department of Chemistry, Ludwig-Maximilians-Universität München, München, Germany
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33
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Chenel A, Dive G, Meier C, Desouter-Lecomte M. Control in a Dissipative Environment: The Example of a Cope Rearrangement. J Phys Chem A 2012; 116:11273-82. [DOI: 10.1021/jp305274y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Chenel
- Laboratoire de Chimie
Physique, Université Paris-Sud and CNRS, UMR 8000, F-91405
Orsay, France
| | - G. Dive
- Centre d’Ingénierie
des Protéines, Université de Liège, Sart Tilman, B6, B-4000 Liège, Belgium
| | - C. Meier
- LCAR-IRSAMC, Université Paul Sabatier, 31062 Toulouse, France
| | - M. Desouter-Lecomte
- Laboratoire de Chimie
Physique, Université Paris-Sud and CNRS, UMR 8000, F-91405
Orsay, France
- Département de Chimie, Université de Liège, Sart Tilman, B6,
B-4000 Liège, Belgium
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34
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Laser control in open quantum systems: preliminary analysis toward the Cope rearrangement control in methyl-cyclopentadienylcarboxylate dimer. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1236-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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35
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Rice SA. Control of Dynamical Processes in Solution: An Overview and Personal Perspective. Isr J Chem 2012. [DOI: 10.1002/ijch.201100069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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García-Vela A. Active control of the lifetime of excited resonance states by means of laser pulses. J Chem Phys 2012; 136:134304. [DOI: 10.1063/1.3698396] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Petersen J, Wohlgemuth M, Sellner B, Bonačić-Koutecký V, Lischka H, Mitrić R. Laser pulse trains for controlling excited state dynamics of adenine in water. Phys Chem Chem Phys 2012; 14:4687-94. [DOI: 10.1039/c2cp24002e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Nuernberger P, Wolpert D, Weiss H, Gerber G. Initiation and control of catalytic surface reactions with shaped femtosecond laser pulses. Phys Chem Chem Phys 2012; 14:1185-99. [DOI: 10.1039/c1cp21827a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Weigel A, Pfaffe M, Sajadi M, Mahrwald R, Improta R, Barone V, Polli D, Cerullo G, Ernsting NP, Santoro F. Barrierless photoisomerisation of the “simplest cyanine”: Joining computational and femtosecond optical spectroscopies to trace the full reaction path. Phys Chem Chem Phys 2012; 14:13350-64. [DOI: 10.1039/c2cp41522d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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du Plessis A, Strydom CA, Uys H, Botha LR. Laser induced and controlled chemical reaction of carbon monoxide and hydrogen. J Chem Phys 2011; 135:204303. [PMID: 22128931 DOI: 10.1063/1.3662129] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Bimolecular chemical reaction control of gaseous CO and H(2) at room temperature and atmospheric pressure, without any catalyst, using shaped femtosecond laser pulses is presented. High intensity laser radiation applied to a reaction cell facilitates non-resonant bond breakage and the formation of a range of ions, which can then react to form new products. Stable reaction products are measured after irradiation of a reaction cell, using time of flight mass spectroscopy. Bond formation of C-O, C-C, and C-H bonds is demonstrated as CO(2)(+), C(2)H(2)(+), CH(+), and CH(3)(+) were observed in the time of flight mass spectrum of the product gas, analyzed after irradiation. The formation of CO(2) is shown to be dependent on laser intensity, irradiation time, and on the presence of H(2) in the reaction cell. Using negatively chirped laser pulses more C-O bond formation takes place as compared to more C-C bond formation for unchirped pulses.
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Oka H. Control of vibronic excitation using quantum-correlated photons. J Chem Phys 2011; 135:164304. [DOI: 10.1063/1.3654136] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Xu S, Shan J, Shi W, Liu L, Xu L. Modifying photoisomerization efficiency by metallic nanostructures. OPTICS EXPRESS 2011; 19:12336-12341. [PMID: 21716470 DOI: 10.1364/oe.19.012336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Trans-to-cis photoisomerization efficiency of azobenzene dye is artificially modified from 0.09 to 0.38 when dye molecules are placed close to gold nanoparticle films with different structures. Transient fluorescence and surface enhanced Raman scattering measurement verify that the enhancement and reduction of photoisomerization efficiency come from the competition between enhanced local optical field from surface plasmon resonance and the accelerated nonradiative decay of excited dye molecules. The photoisomerization efficiency can be further modified by controlling the distance between azobenzene dye and gold films. Our finding can be applied to improve the performance of photoisomerization effect in photochemistry and photonics.
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Affiliation(s)
- Shen Xu
- Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433,China
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Shu CC, Henriksen NE. Coherent control of indirect photofragmentation in the weak-field limit: Control of transient fragment distributions. J Chem Phys 2011; 134:164308. [DOI: 10.1063/1.3582928] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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45
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Moore KW, Pechen A, Feng XJ, Dominy J, Beltrani VJ, Rabitz H. Why is chemical synthesis and property optimization easier than expected? Phys Chem Chem Phys 2011; 13:10048-70. [PMID: 21483988 DOI: 10.1039/c1cp20353c] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Identifying optimal conditions for chemical and material synthesis as well as optimizing the properties of the products is often much easier than simple reasoning would predict. The potential search space is infinite in principle and enormous in practice, yet optimal molecules, materials, and synthesis conditions for many objectives can often be found by performing a reasonable number of distinct experiments. Considering the goal of chemical synthesis or property identification as optimal control problems provides insight into this good fortune. Both of these goals may be described by a fitness function J that depends on a suitable set of variables (e.g., reactant concentrations, components of a material, processing conditions, etc.). The relationship between J and the variables specifies the fitness landscape for the target objective. Upon making simple physical assumptions, this work demonstrates that the fitness landscape for chemical optimization contains no local sub-optimal maxima that may hinder attainment of the absolute best value of J. This feature provides a basis to explain the many reported efficient optimizations of synthesis conditions and molecular or material properties. We refer to this development as OptiChem theory. The predicted characteristics of chemical fitness landscapes are assessed through a broad examination of the recent literature, which shows ample evidence of trap-free landscapes for many objectives. The fundamental and practical implications of OptiChem theory for chemistry are discussed.
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Affiliation(s)
- Katharine W Moore
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
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Schneider J, Wollenhaupt M, Winzenburg A, Bayer T, Köhler J, Faust R, Baumert T. Efficient and robust strong-field control of population transfer in sensitizer dyes with designed femtosecond laser pulses. Phys Chem Chem Phys 2011; 13:8733-46. [DOI: 10.1039/c0cp02723e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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47
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Carlo GG, Ermann L, Borondo F, Benito RM. Environmental stability of quantum chaotic ratchets. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 83:011103. [PMID: 21405657 DOI: 10.1103/physreve.83.011103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Indexed: 05/30/2023]
Abstract
The transitory and stationary behavior of a quantum chaotic ratchet consisting of a biharmonic potential under the effect of different drivings in contact with a thermal environment is studied. For weak forcing and finite ℏ, we identify a strong dependence of the current on the structure of the chaotic region. Moreover, we have determined the robustness of the current against thermal fluctuations in the very weak coupling regime. In the case of strong forcing, the current is determined by the shape of a chaotic attractor. In both cases the temperature quickly stabilizes the ratchet, but in the latter it also destroys the asymmetry responsible for the current generation. Finally, applications to isomerization reactions are discussed.
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Affiliation(s)
- Gabriel G Carlo
- Departamento de Física, CNEA, Libertador 8250, C1429BNP Buenos Aires, Argentina
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48
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Wollenhaupt M, Baumert T. Ultrafast laser control of electron dynamics in atoms, molecules and solids. Faraday Discuss 2011; 153:9-26; discussion 73-91. [DOI: 10.1039/c1fd00109d] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Ruetzel S, Stolzenberger C, Fechner S, Dimler F, Brixner T, Tannor DJ. Molecular quantum control landscapes in von Neumann time-frequency phase space. J Chem Phys 2010; 133:164510. [DOI: 10.1063/1.3495950] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Fuyuki M, Furuta K, Wada A. New photo-isomerization path of indocyanine green in condensed phase investigated by two-pump excitation. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.09.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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