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Delgado-Granados LH, Arango CA, López JG. Preparation of vibrational quasi-bound states of the transition state complex BrHBr from the bihalide ion BrHBr . Phys Chem Chem Phys 2022; 24:21250-21260. [PMID: 36040431 DOI: 10.1039/d2cp03120e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient strategies that allow the preparation of molecular systems in particular vibrational states are important in the application of quantum control schemes to chemical reactions. In this paper, we propose the preparation of quasi-bound vibrational states of the collinear transition state complex BrHBr, from vibrational states of the bihalide ion BrHBr-, that favor the bond selective breakage of BrHBr. The results shown complement the investigation that we reported in a previous paper, [A. J. Garzón-Ramírez, J. G. López and C. A. Arango, Int. J. Quantum Chem., 2018, 24, e25784], in which we demonstrated the feasibility of controlling the bond selective decomposition of the collinear BrHBr using linear combinations of reactive resonances. We employed a dipole moment surface, calculated at the QCISD/d-aug-cc-pVTZ level of theory, to simulate the interaction of the BrHBr- ground vibrational state with heuristically optimized sequences of ultrashort infrared linear chirped laser pulses to achieve a target vibrational state, resulting from expanding a chosen linear combination of reactive resonances of BrHBr in terms of vibrational eigenstates of BrHBr-. The results of our simulations show final states that capture the most relevant features of the target state with different levels of description depending on the sequence of laser pulses employed. We also discuss ways of improving the description of the target state and possible limitations of our approach.
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Affiliation(s)
| | - Carlos A Arango
- Departamento de Ciencias Químicas, Universidad Icesi, Cali, Colombia
| | - José G López
- Departamento de Química, Universidad del Valle, A.A. 25360, Cali, Colombia.
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Das R, Pandey DK, Soumyashree S, P M, Nimma V, Bhardwaj P, K M MS, Singh DK, Kushawaha RK. Strong-field ionization of CH 3Cl: proton migration and association. Phys Chem Chem Phys 2022; 24:18306-18320. [PMID: 35880610 DOI: 10.1039/d2cp02494b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strong-field ionization of CH3Cl using femtosecond laser pulses, and the subsequent two-body dissociation of CH3Cl2+ along Hn+ (n = 1-3) and HCl+ forming pathways, have been experimentally studied in a home-built COLTRIMS (cold target recoil ion momentum spectrometer) setup. The single ionization rate of CH3Cl was obtained experimentally by varying the laser intensity from 1.6 × 1013 W cm-2 to 2.4 × 1014 W cm-2 and fitted with the rate obtained using the MO-ADK model. Additionally, the yield of Hn+ ions resulting from the dissociation of all charge states of CH3Cl was determined as a function of intensity and pulse duration (and chirp). Next, we identified four two-body breakup pathways of CH3Cl2+, which are H+ + CH2Cl+, H2+ + CHCl+, H3+ + CCl+, and CH2+ + HCl+, using photoion-photoion coincidence. The yields of the four pathways were found to decrease on increasing the intensity from I = 4.2 × 1013 W cm-2 to 2I = 8.5 × 1013 W cm-2, which was attributed to enhanced ionization of the dication before it can dissociate. As a function of pulse duration (and chirp), the Hn+ forming pathways were suppressed, while the HCl+ forming pathway was enhanced. To understand the excited state dynamics of the CH3Cl dication, which controls the outcome of dissociation, we obtained the total kinetic energy release distributions of the pathways and the two-dimensional coincidence momentum images and angular distributions of the fragments. We inferred that the Hn+ forming pathways originate from the dissociation of CH3Cl dications from weakly attractive metastable excited states having a long dissociation time, while for the HCl+ forming pathway, the dication dissociates from repulsive states and therefore, undergoes rapid dissociation. Finally, quantum chemical calculations have been performed to understand the intramolecular proton migration and dissociation of the CH3Cl dication along the pathways mentioned above. Our study explains the mechanism of Hn+ and HCl+ formation and confirms that intensity and pulse duration can serve as parameters to influence the excited state dynamics and hence, the outcome of the two-body dissociation of CH3Cl2+.
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Affiliation(s)
- Rituparna Das
- Physical Research Laboratory Ahmedabad, Gujarat 380009, India.
| | - Deepak K Pandey
- Department of Basic Sciences, Institute of Infrastructure Technology Research And Management, Ahmedabad-380026, India.
| | | | - Madhusudhan P
- Physical Research Laboratory Ahmedabad, Gujarat 380009, India.
| | - Vinitha Nimma
- Physical Research Laboratory Ahmedabad, Gujarat 380009, India.
| | - Pranav Bhardwaj
- Physical Research Laboratory Ahmedabad, Gujarat 380009, India.
| | | | - Dheeraj K Singh
- Department of Basic Sciences, Institute of Infrastructure Technology Research And Management, Ahmedabad-380026, India.
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Reusch N, Krein V, Wollscheid N, Weitzel KM. Distinction of Structural Isomers of Benzenediamin and Difluorobenzene by Means of Chirped Femtosecond Laser Ionization Mass Spectrometry. ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zpch-2017-1051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Structural isomers of disubstituted benzenes are difficult to distinguish with most mass spectrometric methods. Consequently, conventional concepts for the distinction of isomers are based on coupling mass spectrometry with a chromatographic method. As an alternative approach, we propose the combination of femtosecond laser ionization with time-of-flight mass spectrometry (fs-LIMS). The possibility of systematic tailoring of fs-laser pulse shapes opens access to a multidimensional analytical technique capable of distinguishing structural isomers of the title molecules.
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Affiliation(s)
- Nicola Reusch
- Philipps-Universität Marburg, Fachbereich Chemie , Hans-Meerwein Str. , 35032 Marburg , Germany
| | - Viola Krein
- Philipps-Universität Marburg, Fachbereich Chemie , Hans-Meerwein Str. , 35032 Marburg , Germany
| | - Nikolaus Wollscheid
- Philipps-Universität Marburg, Fachbereich Chemie , Hans-Meerwein Str. , 35032 Marburg , Germany
| | - Karl-Michael Weitzel
- Philipps-Universität Marburg, Fachbereich Chemie , Hans-Meerwein Str. , 35032 Marburg , Germany
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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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Moore Tibbetts K, Xing X, Rabitz H. Systematic Trends in Photonic Reagent Induced Reactions in a Homologous Chemical Family. J Phys Chem A 2013; 117:8205-15. [DOI: 10.1021/jp403824h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Xi Xing
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544,
United States
| | - Herschel Rabitz
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544,
United States
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Goswami T, Das DK, Goswami D. Controlling the femtosecond laser-driven transformation of dicyclopentadiene into cyclopentadiene. Chem Phys Lett 2013; 558:1-7. [PMID: 24098059 PMCID: PMC3790071 DOI: 10.1016/j.cplett.2012.10.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Dynamics of the chemical transformation of dicyclopentadiene into cyclopentadiene in a supersonic molecular beam is elucidated using femtosecond time-resolved degenerate pump-probe mass spectrometry. Control of this ultrafast chemical reaction is achieved by using linearly chirped frequency modulated pulses. We show that negatively chirped femtosecond laser pulses enhance the cyclopentadiene photo-product yield by an order of magnitude as compared to that of the unmodulated or the positively chirped pulses. This demonstrates that the phase structure of femtosecond laser pulse plays an important role in determining the outcome of a chemical reaction.
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Affiliation(s)
| | - Dipak K. Das
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Debabrata Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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Nag A, Goswami D. Effect of linear chirp on femtosecond two-photon processes in solution. JOURNAL OF SPECTROSCOPY AND DYNAMICS 2012; 2:11. [PMID: 24364002 PMCID: PMC3868930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Coherent control via linear chirping a femtosecond laser pulse holds the promise of a potent spectroscopic tool in the study of two-photon processes in condensed phase. Here, we show modulation in the two-photon absorption and fluorescence of several common dyes in solution by simple phase ordering of femtosecond laser pulse into a linearly frequency chirped pulse. However, the modulation is dependent on associated solvent properties as the coherence is lost rapidly in the solution phase. Also, systematic effects are mostly seen only over a limited range of chirp since it is an interplay of two opposing effects on two-photon processes-linear chirp enhancing it while the associated pulse broadening reducing it.
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Affiliation(s)
- Amit Nag
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh - 208016, India
| | - Debabrata Goswami
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh - 208016, India
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Goswami T, Das DK, Kumar SKK, Goswami D. Chirp and polarization control of femtosecond molecular fragmentation. INDIAN JOURNAL OF PHYSICS AND PROCEEDINGS OF THE INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE (2004) 2012; 86:181-185. [PMID: 24115807 PMCID: PMC3792555 DOI: 10.1007/s12648-012-0039-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We explore the simultaneous effect of chirp and polarization as the two control parameters for non-resonant photo-dissociation of n-propyl benzene. Experiments performed over a wide range of laser intensities show that these two control knobs behave mutually exclusively. Specifically, for the coherently enhanced fragments (C3H3+, C5H5+) with negatively chirped pulses and C6H5+ with positively chirped pulses, polarization effect is the same as compared to that in the case of transform-limited pulses. Though a change in polarization affects the overall fragmentation efficiency, the fragmentation pattern of n-propyl benzene molecule remains unaffected in contrast to the chirp case.
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Affiliation(s)
- T Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, Uttar Pradesh, India
| | - D K Das
- Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, Uttar Pradesh, India
| | - S K Karthick Kumar
- Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, Uttar Pradesh, India
| | - D Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, Uttar Pradesh, India
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Goswami D, Goswami T, Kumar SKK, Das DK. Towards Using Molecular States as Qubits. AIP CONFERENCE PROCEEDINGS 2011; 1384:251-253. [PMID: 23814323 PMCID: PMC3695453 DOI: 10.1063/1.3635869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Molecular systems are presented as possible qubit systems by exploring non-resonant molecular fragmentation of n-propyl benzene with femtosecond laser pulses as a model case. We show that such laser fragmentation process is dependent on the phase and polarization characteristics of the laser. The effect of the chirp and polarization of the femtosecond pulse when applied simultaneously is mutually independent of each other, which makes chirp and polarization as useful 'logic' implementing parameters for such molecular qubits.
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Affiliation(s)
- Debabrata Goswami
- Department of Chemistry, Indian Institute of Technology Kanpur Kanpur - 208016, INDIA
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Das DK, Goswami T, Goswami D. Control of femtosecond laser driven retro-Diels-Alder-like reaction of dicyclopentadiene. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2011; 8173:81730O. [PMID: 23814449 PMCID: PMC3695452 DOI: 10.1117/12.897909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Using femtosecond time resolved degenerate pump-probe mass spectrometry coupled with simple linearly chirped frequency modulated pulse, we elucidate that the dynamics of retro-Diels-Alder-like reaction of diclopentadiene (DCPD) to cyclopentadiene (CPD) in supersonic molecular beam occurs in ultrafast time scale. Negatively chirped pulse enhances the ion yield of CPD, as compared to positively chirped pulse. This indicates that by changing the frequency (chirp) of the laser pulse we can control the ion yield of a chemical reaction.
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Affiliation(s)
- Dipak Kumar Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Tapas Goswami
- Department of Chemistry, Mudd Building, Stanford, CA 94305-5080, USA
| | - Debabrata Goswami
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
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Stefan Lehmann C, Bhargava Ram N, Irimia D, Janssen MHM. Photoelectron photoion coincidence imaging of ultrafast control in multichannel molecular dynamics. Faraday Discuss 2011; 153:173-87; discussion 189-212. [DOI: 10.1039/c1fd00047k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Irimia D, Janssen MHM. Toward elucidating the mechanism of femtosecond pulse shaping control in photodynamics of molecules by velocity map photoelectron and ion imaging. J Chem Phys 2010; 132:234302. [DOI: 10.1063/1.3436720] [Citation(s) in RCA: 16] [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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