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Rouquet E, Dupont J, Lepere V, Garcia GA, Nahon L, Zehnacker A. Conformer-Selective Photoelectron Circular Dichroism. Angew Chem Int Ed Engl 2024; 63:e202401423. [PMID: 38442011 DOI: 10.1002/anie.202401423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 03/04/2024] [Accepted: 03/05/2024] [Indexed: 03/07/2024]
Abstract
Conformational flexibility and chirality both play a key role in molecular recognition. It is therefore very useful to develop spectroscopic methods that simultaneously probe both properties. It has been theoretically predicted that photoelectron circular dichroism (PECD) should be very sensitive to conformational isomerism. However, experimental proof has been less forthcoming and only exists for a very few favorable cases. Here, we present a new PECD scheme based on resonance-enhanced two-photon ionization (RE2PI) using UV/Vis nanosecond laser excitations. The spectral resolution obtained thereby guarantees conformer-selectivity by inducing resonant conformer-specific ππ* S1←S0 transitions. We apply this experimental scheme to the study of chiral 1-indanol, which exists in two conformers linked by a ring inversion and defined by the position of the hydroxyl group, namely axial and equatorial. We show that the PECD of the equatorial and axial forms considerably differ in sign, magnitude and shape. We also discuss the influence of the total ionization energy, vibronic excitation of intermediate and final states, and relative polarization of the excitation and ionization lasers. Conformer-specificity adds a new dimension to the applications of PECD in analytical chemistry addressing now the general case of floppy systems.
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Affiliation(s)
- Etienne Rouquet
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405, Orsay, France
- Synchrotron Soleil, L'Orme des Merisiers, St. Aubin BP48, F-91192, Gif sur Yvette, France
| | - Jennifer Dupont
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405, Orsay, France
| | - Valeria Lepere
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405, Orsay, France
| | - Gustavo A Garcia
- Synchrotron Soleil, L'Orme des Merisiers, St. Aubin BP48, F-91192, Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron Soleil, L'Orme des Merisiers, St. Aubin BP48, F-91192, Gif sur Yvette, France
| | - Anne Zehnacker
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405, Orsay, France
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2
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Jeong C, Yun J, Heo J, Kim NJ. Anisotropic circular dichroism of jet-cooled chiral molecules. Phys Chem Chem Phys 2023; 25:22644-22649. [PMID: 37591819 DOI: 10.1039/d3cp03074a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
Anisotropic circular dichroism (CD) refers to the CD of oriented molecules, which varies with the direction of light propagation toward the molecules. Thus, anisotropic CD spectroscopy has been used to investigate the orientations of molecules in anisotropic media such as liquid crystals and thin films. However, it is unclear whether anisotropic CD results from isolated chromophores or their intermolecular interactions with other atoms or molecules that form anisotropically aligned structures. Herein, anisotropic CD of isolated chiral molecules was observed for the first time. The resonant two-photon ionization CD spectra of jet-cooled pseudoephedrine and styrene oxide indicated a difference between the CD values of the P/R and Q branches of the origin bands of the S0-S1 transition. This difference may have resulted from the anisotropic CD phenomena of these molecules, which are oriented via photoselection. Although jet-cooled molecules may have nearly random orientations, those excited to the P/R or Q branch become oriented because the transition probability to these branches depends on the molecular orientation relative to the direction of light propagation. These results demonstrate that the CD spectra of cold, isolated molecules, such as those in an interstellar medium, may exhibit anisotropic CD values.
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Affiliation(s)
- Changseop Jeong
- Department of Chemistry, Chungbuk National University, Chungbuk 28644, Korea.
| | - Jiyeon Yun
- Department of Chemistry, Chungbuk National University, Chungbuk 28644, Korea.
| | - Jiyoung Heo
- Department of Green Chemical Engineering, Sangmyung University, Chungnam 31066, Korea.
| | - Nam Joon Kim
- Department of Chemistry, Chungbuk National University, Chungbuk 28644, Korea.
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3
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Montoya-Castillo A, Chen MS, Raj SL, Jung KA, Kjaer KS, Morawietz T, Gaffney KJ, van Driel TB, Markland TE. Optically Induced Anisotropy in Time-Resolved Scattering: Imaging Molecular-Scale Structure and Dynamics in Disordered Media with Experiment and Theory. PHYSICAL REVIEW LETTERS 2022; 129:056001. [PMID: 35960558 DOI: 10.1103/physrevlett.129.056001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Time-resolved scattering experiments enable imaging of materials at the molecular scale with femtosecond time resolution. However, in disordered media they provide access to just one radial dimension thus limiting the study of orientational structure and dynamics. Here we introduce a rigorous and practical theoretical framework for predicting and interpreting experiments combining optically induced anisotropy and time-resolved scattering. Using impulsive nuclear Raman and ultrafast x-ray scattering experiments of chloroform and simulations, we demonstrate that this framework can accurately predict and elucidate both the spatial and temporal features of these experiments.
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Affiliation(s)
| | - Michael S Chen
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Sumana L Raj
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Kenneth A Jung
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Kasper S Kjaer
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Tobias Morawietz
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Kelly J Gaffney
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Tim B van Driel
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Thomas E Markland
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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Jeong C, Eun HJ, Yun J, Kim NJ. Dual-Beam Circular Dichroism Spectroscopy of Jet-Cooled Chiral Molecules. J Phys Chem A 2022; 126:4295-4299. [PMID: 35758322 DOI: 10.1021/acs.jpca.2c02745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Circular dichroism (CD) spectroscopy of jet-cooled molecules provides conformation-specific CD spectra. However, its widespread utilization has been limited by the weak CD effects and the low density of gas-phase molecules. Here, we developed a dual-beam method to improve the sensitivity and accuracy of gas-phase CD measurements. Circularly and linearly polarized pulses were generated from a single laser pulse and used to irradiate a single molecular-beam pulse to produce two ion peaks. The ion peaks induced by linearly polarized pulses were subtracted from those induced by circularly polarized pulses to correct the CD values for the pulse-to-pulse fluctuations in laser power and gas density. The resonant two-photon ionization CD spectrum of (1R,2R)-(-)-pseudoephedrine revealed that the standard deviations of CD values measured using the dual-beam method were three times lower than those measured using a single-beam method. The dual-beam method provides an effective, accurate, and easy-to-use tool to obtain gas-phase CD spectra.
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Affiliation(s)
- Changseop Jeong
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Han Jun Eun
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Jiyeon Yun
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Nam Joon Kim
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
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5
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Nakashima Y, Ito Y, Kominato M, Ohshimo K, Misaizu F. Photofragment ion imaging in vibrational predissociation of the H 2O +Ar complex ion. J Chem Phys 2021; 154:174301. [PMID: 34241084 DOI: 10.1063/5.0049609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Vibrational predissociation processes of the H2O+Ar complex ion following mid-infrared excitations of the OH stretching modes and bending overtone of the H2O+ unit were studied by photofragment ion imaging. The anisotropy parameters, β, of the angular distributions of the photofragment ions were clearly dependent on the type (branch) of rotational excitation, β > 0 for the P-branch excitations, while β < 0 for the Q-branch excitations, which were consistent with the previous theoretical predictions for the rotationally resolved optical transition of a prolate symmetric top. The translational energy distributions had a similar form, irrespective of the excitation modes. This result suggests that the prepared excited states underwent a common relaxation pathway via the bending or bending overtone state of the H2O+ unit. In addition, the available energy was preferentially distributed into the rotational energy of the H2O+ fragment ions rather than the translational energy. The mechanism of the rotational excitations of the H2O+ fragment ions was discussed based on the steric configuration of the H2O+ and Ar units at the moment of dissociation.
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Affiliation(s)
- Yuji Nakashima
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Yuri Ito
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Mizuhiro Kominato
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Keijiro Ohshimo
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Fuminori Misaizu
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Vester P, Zaluzhnyy IA, Kurta RP, Møller KB, Biasin E, Haldrup K, Nielsen MM, Vartanyants IA. Ultrafast structural dynamics of photo-reactions observed by time-resolved x-ray cross-correlation analysis. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2019; 6:024301. [PMID: 30915388 PMCID: PMC6416776 DOI: 10.1063/1.5086374] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/10/2019] [Indexed: 05/08/2023]
Abstract
We applied angular X-ray Cross-Correlation analysis (XCCA) to scattering images from a femtosecond resolution X-ray free-electron laser pump-probe experiment with solvated PtPOP {[Pt2(P2O5H2)4]4-} metal complex molecules. The molecules were pumped with linear polarized laser pulses creating an excited state population with a preferred orientational (alignment) direction. Two time scales of 1.9 ± 1.5 ps and 46 ± 10 ps were revealed by angular XCCA associated with structural changes and rotational dephasing of the solvent molecules, respectively. These results illustrate the potential of XCCA to reveal hidden structural information in the analysis of time-resolved x-ray scattering data from molecules in solution.
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Affiliation(s)
- Peter Vester
- Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | | | - Ruslan P Kurta
- European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - Klaus B Møller
- Department of Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | | | - Kristoffer Haldrup
- Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
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7
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Haldrup K, Levi G, Biasin E, Vester P, Laursen MG, Beyer F, Kjær KS, Brandt van Driel T, Harlang T, Dohn AO, Hartsock RJ, Nelson S, Glownia JM, Lemke HT, Christensen M, Gaffney KJ, Henriksen NE, Møller KB, Nielsen MM. Ultrafast X-Ray Scattering Measurements of Coherent Structural Dynamics on the Ground-State Potential Energy Surface of a Diplatinum Molecule. PHYSICAL REVIEW LETTERS 2019; 122:063001. [PMID: 30822093 DOI: 10.1103/physrevlett.122.063001] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Indexed: 05/21/2023]
Abstract
We report x-ray free electron laser experiments addressing ground-state structural dynamics of the diplatinum anion Pt_{2}POP_{4} following photoexcitation. The structural dynamics are tracked with <100 fs time resolution by x-ray scattering, utilizing the anisotropic component to suppress contributions from the bulk solvent. The x-ray data exhibit a strong oscillatory component with period 0.28 ps and decay time 2.2 ps, and structural analysis of the difference signal directly shows this as arising from ground-state dynamics along the PtPt coordinate. These results are compared with multiscale Born-Oppenheimer molecular dynamics simulations and demonstrate how off-resonance excitation can be used to prepare a vibrationally cold excited-state population complemented by a structure-dependent depletion of the ground-state population which subsequently evolves in time, allowing direct tracking of ground-state structural dynamics.
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Affiliation(s)
- Kristoffer Haldrup
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Gianluca Levi
- Technical University of Denmark, Department of Chemistry, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
- Current address: Science Institute of the University of Iceland, VR-III, 107 Reykjavík, Iceland
| | - Elisa Biasin
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Peter Vester
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Mads Goldschmidt Laursen
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Frederik Beyer
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Kasper Skov Kjær
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
- Department of Chemical Physics, Lund University, Box 118, S-22100 Lund, Sweden
| | - Tim Brandt van Driel
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Tobias Harlang
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
- Department of Chemical Physics, Lund University, Box 118, S-22100 Lund, Sweden
| | - Asmus O Dohn
- Technical University of Denmark, Department of Chemistry, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
- Science Institute of the University of Iceland, VR-III, 107 Reykjavík, Iceland
| | - Robert J Hartsock
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Silke Nelson
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - James M Glownia
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Henrik T Lemke
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
- SwissFEL, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Morten Christensen
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Kelly J Gaffney
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Niels E Henriksen
- Technical University of Denmark, Department of Chemistry, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
| | - Klaus B Møller
- Technical University of Denmark, Department of Chemistry, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
| | - Martin M Nielsen
- Technical University of Denmark, Department of Physics, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
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8
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Biasin E, van Driel TB, Levi G, Laursen MG, Dohn AO, Moltke A, Vester P, Hansen FBK, Kjaer KS, Harlang T, Hartsock R, Christensen M, Gaffney KJ, Henriksen NE, Møller KB, Haldrup K, Nielsen MM. Anisotropy enhanced X-ray scattering from solvated transition metal complexes. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:306-315. [PMID: 29488907 DOI: 10.1107/s1600577517016964] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 11/24/2017] [Indexed: 05/23/2023]
Abstract
Time-resolved X-ray scattering patterns from photoexcited molecules in solution are in many cases anisotropic at the ultrafast time scales accessible at X-ray free-electron lasers (XFELs). This anisotropy arises from the interaction of a linearly polarized UV-Vis pump laser pulse with the sample, which induces anisotropic structural changes that can be captured by femtosecond X-ray pulses. In this work, a method for quantitative analysis of the anisotropic scattering signal arising from an ensemble of molecules is described, and it is demonstrated how its use can enhance the structural sensitivity of the time-resolved X-ray scattering experiment. This method is applied on time-resolved X-ray scattering patterns measured upon photoexcitation of a solvated di-platinum complex at an XFEL, and the key parameters involved are explored. It is shown that a combined analysis of the anisotropic and isotropic difference scattering signals in this experiment allows a more precise determination of the main photoinduced structural change in the solute, i.e. the change in Pt-Pt bond length, and yields more information on the excitation channels than the analysis of the isotropic scattering only. Finally, it is discussed how the anisotropic transient response of the solvent can enable the determination of key experimental parameters such as the instrument response function.
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Affiliation(s)
- Elisa Biasin
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Tim B van Driel
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Gianluca Levi
- Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
| | - Mads G Laursen
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Asmus O Dohn
- Faculty of Physical Sciences, University of Iceland, Reykjavik, Iceland
| | - Asbjørn Moltke
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Peter Vester
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Frederik B K Hansen
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Kasper S Kjaer
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Tobias Harlang
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Robert Hartsock
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Morten Christensen
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Kelly J Gaffney
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Niels E Henriksen
- Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
| | - Klaus B Møller
- Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kongens Lyngby, Denmark
| | - Kristoffer Haldrup
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
| | - Martin M Nielsen
- Department of Physics, Technical University of Denmark, Fysikvej 307, DK-2800 Kongens Lyngby, Denmark
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9
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Staniforth M, Daly S, Reid KL, Powis I. A generic π* shape resonance observed in energy-dependent photoelectron angular distributions from two-colour, resonant multiphoton ionization of difluorobenzene isomers. J Chem Phys 2013; 139:064304. [DOI: 10.1063/1.4817324] [Citation(s) in RCA: 13] [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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10
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Kay JJ, Steill JD, Kłos J, Paterson G, Costen ML, Strecker KE, McKendrick KG, Alexander MH, Chandler DW. Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A2Σ+) with Ar and He. Mol Phys 2012. [DOI: 10.1080/00268976.2012.670283] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Yoder BL, Bisson R, Morten Hundt P, Beck RD. Alignment dependent chemisorption of vibrationally excited CH4(ν3) on Ni(100), Ni(110), and Ni(111). J Chem Phys 2011; 135:224703. [DOI: 10.1063/1.3665136] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Yoder BL, Bisson R, Beck RD. Steric Effects in the Chemisorption of Vibrationally Excited Methane on Ni(100). Science 2010; 329:553-6. [DOI: 10.1126/science.1191751] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Bruce L. Yoder
- Laboratoire de Chimie Physique Moléculaire, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Régis Bisson
- Laboratoire de Chimie Physique Moléculaire, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Rainer D. Beck
- Laboratoire de Chimie Physique Moléculaire, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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13
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Burrows SM, Pappas D. Comparison of methods to classify and quantify free and bound states of complexes using single molecule fluorescence anisotropy. Analyst 2009; 134:1911-21. [DOI: 10.1039/b905847h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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14
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Vibrationally mediated photodissociation of ammonia: product angular distributions from adiabatic and nonadiabatic dissociation. Mol Phys 2008. [DOI: 10.1080/00268970802245192] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Manzhos S, Romanescu C, Loock HP, Underwood JG. Two-photon state selection and angular momentum polarization probed by velocity map imaging: Application to H atom photofragment angular distributions from the photodissociation of two-photon state selected HCl and HBr. J Chem Phys 2004; 121:11802-9. [PMID: 15634144 DOI: 10.1063/1.1809571] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A formalism for calculating the angular momentum polarization of an atom or a molecule following two-photon excitation of a J-selected state is presented. This formalism is used to interpret the H atom photofragment angular distributions from single-photon dissociation of two-photon rovibronically state selected HCl and HBr prepared via a Q-branch transition. By comparison of the angular distributions measured using the velocity map imaging technique with the theoretical model it is shown that single-photon dissociation of two-photon prepared states can be used for pathway identification, allowing for the identification of the virtual state symmetry in the two-photon absorption and/or the symmetry of the dissociative state. It is also shown that under conditions of excitation with circularly polarized light, or for excitation via non-Q-branch transitions with linearly polarized light the angular momentum polarization is independent of the dynamics of the two-photon transition and analytically computable.
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Affiliation(s)
- Sergei Manzhos
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
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