1
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Perera CA, Amarasinghe C, Guo H, Suits AG. Cold collisions of hot molecules. Phys Chem Chem Phys 2023; 25:22595-22606. [PMID: 37602475 DOI: 10.1039/d3cp02071a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
In this Perspective, we review our recent work on rotationally inelastic collisions of highly vibrationally excited NO molecules prepared in single rotational and parity levels at v = 10 using stimulated emission pumping (SEP). This state preparation is employed in a recently developed crossed molecular beam apparatus where two nearly copropagating molecular beams achieve an intersection angle of 4° at the interaction region. This near-copropagating beam geometry of the molecular beams permits very wide tuning of the collision energy, from far above room temperature down to 2 K where we test the theoretical treatment of the attractive part of the potentials and the difference potential for the first time. We have obtained differential cross sections for state-to-state collisions of NO (v = 10) with Ar and Ne in both spin-orbit manifolds using velocity map imaging. Overall good agreement of the experimental results was seen with quantum mechanical close-coupling calculations done on both coupled-cluster and multi-reference configuration interaction potential energy surfaces. Probing cold collisions of NO carrying ∼2 eV of vibrational excitation allows us to test state-of-the-art theory in this extreme nonequilibrium regime.
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Affiliation(s)
- Chatura A Perera
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
| | | | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
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2
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Ranathunga Y, Olowolafe T, Orunesajo E, Musah H, Lee SK, Li W. Slicing Newton spheres with a two-camera 3D imaging system. J Chem Phys 2023; 158:2890464. [PMID: 37184004 DOI: 10.1063/5.0151048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 04/27/2023] [Indexed: 05/16/2023] Open
Abstract
We demonstrate a simple approach to achieve three-dimensional ion momentum imaging. The method employs two complementary metal-oxide-semiconductor cameras in addition to a standard microchannel plates/phosphor screen imaging detector. The two cameras are timed to measure the decay of luminescence excited by ion hits to extract the time of flight. The achieved time resolution is better than 10 ns, which is mainly limited by camera jitters. A better than 5 ns resolution can be achieved when the jitter is suppressed.
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Affiliation(s)
- Yasashri Ranathunga
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Temitayo Olowolafe
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Emmanuel Orunesajo
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Hackim Musah
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Suk Kyoung Lee
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Wen Li
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
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3
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Chien TE, Hohmann L, Harding DJ. Near-ambient pressure velocity map imaging. J Chem Phys 2022; 157:034201. [DOI: 10.1063/5.0098495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present a new velocity map imaging instrument for studying molecular beam surface scattering in a near-ambient pressure (NAP-VMI) environment. The instrument offers the possibility to study chemical reaction dynamics and kinetics where higher pressures are either desired or unavoidable, adding a new tool to help close the “pressure gap” between surface science and applied catalysis. NAP-VMI conditions are created by two sets of ion optics that guide ions through an aperture and map their velocities. The aperture separates the high pressure ionization region and maintains the necessary vacuum in the detector region. The performance of the NAP-VMI is demonstrated with results from N2O photodissociation and N2 scattering from a Pd(110) surface, which are compared under vacuum and at near-ambient pressure (1 × 10−3 mbar). NAP-VMI has the potential to be applied to, and useful for, a broader range of experiments, including photoelectron spectroscopy and scattering with liquid microjets.
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Affiliation(s)
- Tzu-En Chien
- Department of Chemical Engineering, KTH Royal Institute of Technology, Stockholm 100 44, Sweden
| | - Lea Hohmann
- Department of Chemical Engineering, KTH Royal Institute of Technology, Stockholm 100 44, Sweden
| | - Dan J. Harding
- Department of Chemical Engineering, KTH Royal Institute of Technology, Stockholm 100 44, Sweden
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4
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Perera CA, Zuo J, Guo H, Suits AG. Differential Cross Sections for Cold, State-to-State Spin-Orbit Changing Collisions of NO( v = 10) with Neon. J Phys Chem A 2022; 126:3338-3346. [PMID: 35605132 DOI: 10.1021/acs.jpca.2c02698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Inelastic scattering processes have proven a powerful means of investigating molecular interactions, and much current effort is focused on the cold and ultracold regime where quantum phenomena are clearly manifested. Studies of collisions of the open shell nitric oxide (NO) molecule have been central in this effort since the pioneering work of Houston and co-workers in the early 1990s. State-to-state scattering of vibrationally excited molecules in the cold regime introduces challenges that test the suitability of current theoretical methods for ab initio determination of intermolecular potentials, and concomitant electronically nonadiabatic processes raise the bar further. Here we report measurements of differential cross sections for state-to-state spin-orbit changing collisions of NO (v = 10, Ω″ = 1.5, and j″ = 1.5) with neon from 2.3 to 3.5 cm-1 collision energy using our recently developed near-copropagating beam technique. The experimental results are compared with those obtained from quantum scattering calculations on a high-level set of coupled cluster potential energy surfaces and are shown to be in good agreement. The theoretical results suggest that distinct backscattering in the 2.3 cm-1 case arises from overlapping resonances.
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Affiliation(s)
- Chatura A Perera
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Junxiang Zuo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
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5
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Sparling C, Ruget A, Leach J, Townsend D. Arbitrary image reinflation: A deep learning technique for recovering 3D photoproduct distributions from a single 2D projection. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:023303. [PMID: 35232150 DOI: 10.1063/5.0082744] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 01/26/2022] [Indexed: 06/14/2023]
Abstract
Many charged particle imaging measurements rely on the inverse Abel transform (or related methods) to reconstruct three-dimensional (3D) photoproduct distributions from a single two-dimensional (2D) projection image. This technique allows for both energy- and angle-resolved information to be recorded in a relatively inexpensive experimental setup, and its use is now widespread within the field of photochemical dynamics. There are restrictions, however, as cylindrical symmetry constraints on the overall form of the distribution mean that it can only be used with a limited range of laser polarization geometries. The more general problem of reconstructing arbitrary 3D distributions from a single 2D projection remains open. Here, we demonstrate how artificial neural networks can be used as a replacement for the inverse Abel transform and-more importantly-how they can be used to directly "reinflate" 2D projections into their original 3D distributions, even in cases where no cylindrical symmetry is present. This is subject to the simulation of appropriate training data based on known analytical expressions describing the general functional form of the overall anisotropy. Using both simulated and real experimental data, we show how our arbitrary image reinflation (AIR) neural network can be utilized for a range of different examples, potentially offering a simple and flexible alternative to more expensive and complicated 3D imaging techniques.
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Affiliation(s)
- Chris Sparling
- Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Alice Ruget
- Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Jonathan Leach
- Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Dave Townsend
- Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
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6
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Sofikitis D. Wavelength dependence of the angular distribution of the Coulomb explosion in the femtosecond ionisation of methyl iodide. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1995063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Dimitris Sofikitis
- Department of Physics, Atomic and Molecular Physics Laboratory, University of Ioannina, Ioannina, Greece
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7
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Tahereh Alavi S, Cooper GA, Suits AG. Coulomb explosion dynamics of methoxycarbonylsulfenyl chloride by 3D multimass imaging. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1988170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- S. Tahereh Alavi
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - Graham A. Cooper
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - Arthur G. Suits
- Department of Chemistry, University of Missouri, Columbia, MO, USA
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8
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Weeraratna C, Kostko O, Ahmed M. An investigation of aqueous ammonium nitrate aerosols with soft X-ray spectroscopy. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1983058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Chaya Weeraratna
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Oleg Kostko
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Musahid Ahmed
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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9
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Cooper GA, Alavi ST, Li W, Lee SK, Suits AG. Coulomb Explosion Dynamics of Chlorocarbonylsulfenyl Chloride. J Phys Chem A 2021; 125:5481-5489. [PMID: 34138560 DOI: 10.1021/acs.jpca.1c02332] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Coulomb explosion dynamics following strong field ionization of chlorocarbonylsulfenyl chloride was studied using multimass coincidence detection and covariance imaging analysis, supported by density functional theory calculations. These results show evidence of multiple dissociation channels from various charge states. Double ionization to low-lying electronic states leads to a dominant C-S cleavage channel, while higher states can alternatively correlate to the loss of Cl+. Triple ionization leads to a double dissociation channel, the observation of which is confirmed via three-body covariance analysis, while further ionization leads primarily to atomic or diatomic fragments whose relative momenta depend strongly on the starting structure of the molecule.
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Affiliation(s)
- Graham A Cooper
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - S Tahereh Alavi
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Wen Li
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Suk Kyoung Lee
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
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10
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Sakkoula E, van Oorschot BGM, Parker DH. A compact electrostatic lens for velocity map imaging experiments. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1910357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- E. Sakkoula
- Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, Netherlands
| | - B. G. M. van Oorschot
- Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, Netherlands
| | - D. H. Parker
- Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, Netherlands
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11
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Foley CD, Cooper GA, Tu J, Harmata M, Suits AG. HDCO radical dissociation thresholds by velocity map imaging. Mol Phys 2021. [DOI: 10.1080/00268976.2020.1813344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- C. D. Foley
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - G. A. Cooper
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - J. Tu
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - M. Harmata
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - A. G. Suits
- Department of Chemistry, University of Missouri, Columbia, MO, USA
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12
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Allum F, Mason R, Burt M, Slater CS, Squires E, Winter B, Brouard M. Post extraction inversion slice imaging for 3D velocity map imaging experiments. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1842531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Felix Allum
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Robert Mason
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Michael Burt
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Craig S. Slater
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Eleanor Squires
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Benjamin Winter
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Mark Brouard
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
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13
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Arlt J, Singh DP, Thompson JOF, Chatterley AS, Hockett P, Stapelfeldt H, Reid KL. Photoelectron angular distributions from resonant two-photon ionisation of adiabatically aligned naphthalene and aniline molecules. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1836411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jacqueline Arlt
- Department of Chemistry, Aarhus University, Aarhus C, Denmark
| | | | | | | | - Paul Hockett
- Steacie Institute for Molecular Science, National Research Council of Canada, Ottawa, Canada
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14
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Amarasinghe C, Perera CA, Suits AG. A versatile molecular beam apparatus for cold/ultracold collisions. J Chem Phys 2020; 152:184201. [PMID: 32414267 DOI: 10.1063/5.0007382] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have developed an apparatus capable of performing intrabeam and near-copropagating beam scattering experiments at collision energies from room temperature to below 1 K where interesting quantum phenomena can be observed. A detailed description of the major components of the apparatus, single and dual molecular beam valves, high speed chopper, and the discharge source, is presented. With the intrabeam scattering setup, a novel dual-slit chopper permits collision energies down to millikelvins with a collision energy spread of 20%. With the near-copropagating beam configuration, state-to-state differential cross sections for rotationally inelastic collisions of highly vibrationally excited NO molecules with Ar have been measured at broadly tunable energies documenting the versatility of the instrument. Future applications in stereodynamics and cold state-to-state collisions of vibrationally excited polyatomic molecules are briefly discussed.
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Affiliation(s)
| | - Chatura A Perera
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | - Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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15
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Weeraratna C, Amarasinghe C, Joalland B, Suits AG. Ethylene Intersystem Crossing Caught in the Act by Photofragment Sulfur Atoms. J Phys Chem A 2020; 124:1712-1719. [PMID: 31941276 DOI: 10.1021/acs.jpca.9b11445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ethylene, C2H4, the simplest π-bonded molecule, is of enormous fundamental and commercial importance. Its lowest triplet state, in which the CH2 moieties occupy perpendicular planes, is well known from theory, but there has been no definitive experimental observation of this species. Here, velocity map imaging of the sulfur atoms in ethylene sulfide (c-C2H4S) photodissociation at 217 nm is used to reveal the internal state distribution of co-product ethylene. While both S (1D) and S (3P) translational energy distributions display three distinct regions that find their origins in singlet and triplet excited states of c-C2H4S, respectively, the S (3P) distribution is dominated by a fourth, low-recoil region. In this region, the distribution is fully isotropic at a recoil of 9 ± 1 kcal/mol, corresponding to the opening of the triplet ethylene channel. Multireference calculations suggest that this photodissociation pathway is mediated by a hot, transient biradical CH2CH2S that strongly favors CH2-hindered rotations in the predissociated complex. This photochemical ring-opening mechanism is invoked to account for the vibrational features observed in this low-recoil region, which are attributed to triplet ethylene relaxing to the torsional saddle point on the ground-state singlet surface. This study thereby gives for the first time the experimental confirmation of an adiabatic singlet-triplet splitting of 66 ± 1 kcal/mol and a torsional barrier height of 64 ± 1 kcal/mol in ethylene.
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Affiliation(s)
- Chaya Weeraratna
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211 United States
| | - Chandika Amarasinghe
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211 United States
| | - Baptiste Joalland
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211 United States
| | - Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211 United States
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16
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Weeraratna C, Vasyutinskii OS, Suits AG. Photodissociation by Circularly Polarized Light Yields Photofragment Alignment in Ozone Arising Solely from Vibronic Interactions. PHYSICAL REVIEW LETTERS 2019; 122:083403. [PMID: 30932584 DOI: 10.1103/physrevlett.122.083403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 01/09/2019] [Indexed: 06/09/2023]
Abstract
We present a direct determination of photofragment alignment produced by circularly polarized light in photolysis of a planar polyatomic molecule. This alignment arises via a new mechanism involving coherent excitation of two mutually perpendicular in-plane transition dipole moment components. The alignment is described by a new anisotropy parameter γ_{2}^{'} that was isolated by a unique laser polarization geometry. The determination of the parameter γ_{2}^{'} was realized in ozone photolysis at 266 nm where dc slice images of O(^{1}D_{2}) atomic fragments were acquired. A model developed for interpretation of the photolysis mechanism shows that it can exist only in case of failure of the Born-Oppenheimer approximation when electronic and vibrational (vibronic) interactions have to be taken into account. This finding suggests that determination of the alignment parameter γ_{2}^{'} can be used as a key for direct insight into vibronic interactions in photolysis of polyatomic molecules. The results obtained for ozone photolysis via the Hartley band showed significant γ_{2}^{'} alignment but little recoil speed dependence, consistent with the notion that, as opposed to the situation for derivative coupling, under our experimental conditions, the vibronic contributions to the nonadiabatic dynamics are not dependent on recoil speed.
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Affiliation(s)
- Chaya Weeraratna
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | | | - Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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17
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Foley CD, Alavi ST, Joalland B, Broderick BM, Dias N, Suits AG. Imaging the infrared multiphoton excitation and dissociation of propargyl chloride. Phys Chem Chem Phys 2019; 21:1528-1535. [PMID: 30617359 DOI: 10.1039/c8cp06668j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Infrared multiphoton excitation is combined with UV excitation and state-resolved probes of Cl(2P3/2), Cl*(2P1/2), and HCl to study the photochemistry of propargyl chloride. The results show evidence both of infrared multiphoton dissociation on the ground electronic state and infrared multiphoton excitation followed by UV dissociation. The results are interpreted with the aid of a full characterization of the stationary points on the ground state using ab initio methods, as well as our recent experimental and theoretical characterization of the UV photochemistry of the molecule. The data suggest elimination of HCl on the ground electronic state produces linear propadienylidene as a coproduct over a roaming-like transition state that accesses the Cl-H-C abstraction geometry. This identification is supported by separate chirped-pulse microwave studies in a quasi-uniform flow also reported here.
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Affiliation(s)
- Casey D Foley
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
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18
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Li H, Kamasah A, Suits AG. Imaging H abstraction dynamics in crossed molecular beams: O(3P) + propanol isomers. Phys Chem Chem Phys 2019; 21:14186-14194. [DOI: 10.1039/c8cp06351f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Direct rebound dynamics are revealed for bimolecular reaction of the ground state O(3P) atom with propanol isomers, involving the post transition state long-range dipole–dipole interaction between the dipolar OH and hydroxypropyl radicals.
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Affiliation(s)
- Hongwei Li
- Department of Chemistry
- University of Missouri Columbia
- MO 65211
- USA
| | | | - Arthur G. Suits
- Department of Chemistry
- University of Missouri Columbia
- MO 65211
- USA
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19
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Suits AG. Invited Review Article: Photofragment imaging. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:111101. [PMID: 30501356 DOI: 10.1063/1.5045325] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 10/25/2018] [Indexed: 06/09/2023]
Abstract
Photodissociation studies in molecular beams that employ position-sensitive particle detection to map product recoil velocities emerged thirty years ago and continue to evolve with new laser and detector technologies. These powerful methods allow application of tunable laser detection of single product quantum states, simultaneous measurement of velocity and angular momentum polarization, measurement of joint product state distributions for the detected and undetected products, coincident detection of multiple product channels, and application to radicals and ions as well as closed-shell molecules. These studies have permitted deep investigation of photochemical dynamics for a broad range of systems, revealed new reaction mechanisms, and addressed problems of practical importance in atmospheric, combustion, and interstellar chemistry. This review presents an historical overview, a detailed technical account of the range of methods employed, and selected experimental highlights illustrating the capabilities of the method.
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Affiliation(s)
- Arthur G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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20
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Weeraratna C, Amarasinghe C, Lee SK, Li W, Suits AG. Demonstration of multi-hit and multi-mass capability of 3D imaging in a conventional velocity map imaging experiment. J Chem Phys 2018; 149:084202. [DOI: 10.1063/1.5040589] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Chaya Weeraratna
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | | | - Suk Kyoung Lee
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Wen Li
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Arthur G. Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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21
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Foley CD, Joalland B, Alavi ST, Suits AG. Mixed transitions in the UV photodissociation of propargyl chloride revealed by slice imaging and multireference ab initio calculations. Phys Chem Chem Phys 2018; 20:27474-27481. [DOI: 10.1039/c8cp04596h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Resonance-enhanced multiphoton ionization (REMPI) and DC slice imaging were used to detect photoproducts Cl (2P3/2), spin–orbit excited Cl* (2P1/2), and C3H3 in the photodissociation of propargyl chloride at 212 and 236 nm.
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Affiliation(s)
- Casey D. Foley
- Department of Chemistry
- University of Missouri
- Columbia
- USA
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22
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Amarasinghe C, Kamasah A, Foley CD, Thompson JOF, Suits AG. Imaging the Photodissociation Dynamics of Nitrous Acid (HONO): The Role of Torsion. J Phys Chem A 2017; 121:7503-7510. [DOI: 10.1021/acs.jpca.7b08120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chandika Amarasinghe
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Alexander Kamasah
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Casey D. Foley
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - James O. F. Thompson
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Arthur G. Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
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