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Garcia GA, Dossmann H, Nahon L, Daly S, Powis I. Photoelectron circular dichroism and spectroscopy of trifluoromethyl- and methyl-oxirane: a comparative study. Phys Chem Chem Phys 2014; 16:16214-24. [DOI: 10.1039/c4cp01941e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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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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A study of the valence shell electronic structure and photoionisation dynamics of para-dichlorobenzene and para-bromochlorobenzene. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2012.09.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kuznetsov VV, Semenov SK, Cherepkov NA. Photoionization of fixed-in-space molecules by partially polarized light. J Chem Phys 2011; 134:134301. [DOI: 10.1063/1.3574007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Toffoli D, Lucchese RR, Lebech M, Houver JC, Dowek D. Molecular frame and recoil frame photoelectron angular distributions from dissociative photoionization of NO2. J Chem Phys 2007; 126:054307. [PMID: 17302477 DOI: 10.1063/1.2432124] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The authors report measured and computed molecular frame photoelectron angular distributions (MFPADs) and recoil frame photoelectron angular distributions (RFPADs) for the single photon ionization of the nonlinear molecule NO2 leading to the (1a2)-1 b 3A2 and (4a1)-1 3A1 states of NO2+. Experimentally, the RFPADs were obtained using the vector correlation approach applied to the dissociative photoionization (DPI) involving these molecular ionic states. The polar and azimuthal angle dependences of the photoelectron angular distributions are measured relative to the reference frame provided by the ion recoil axis and direction of polarization of the linearly polarized light. Experimental results are reported for the photon excitation energies hnu=14.4 and 22.0 eV. Theoretically the authors give expressions for both the MFPAD and the RFPAD. They show that the functional form in the recoil frame, where an average over the azimuthal dependence of the molecular fragments about the recoil direction is made, is identical to that they have earlier found for the DPI experiments performed on linear molecules. MFPADs were then computed using single-center expansion techniques within the fixed-nuclei frozen-core Hartree-Fock approximation. The computed cross sections for ionization to the (1a2)-1 b 3A2 state show a strong propensity for ionization with the polarization of the light perpendicular to the plane of the molecule, whereas the ionization to the (4a1)-1 3A1 state of the ion is of similar intensity for all orientations of the polarization of the light in the molecular frame. These qualitative features of the MFPAD are also evident in the RFPAD. The RFPAD for ionization leading to the (1a2)-1 b 3A2 state is strongly peaked in the perpendicular orientation, whereas the RFPAD for ionization leading to the (4a2)-1 3A1 state is much more nearly isotropic. Comparison between experimental and theoretical RFPADs indicates that the recoil angle for NO+ fragments is approximately 50 degrees relative to the symmetry axis of the initial C2v symmetry of the NO2 molecule in the ionization leading to the (1a2)-1 b 3A2 state and the recoil angle is approximately 120 degrees for the O+ fragment for ionization leading to the (4a1)-1 3A1 state.
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Affiliation(s)
- Daniele Toffoli
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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Bellm SM, Reid KL. Reevaluation of the use of photoelectron angular distributions as a probe of dynamical processes: strong dependence of such distributions from s1 paradifluorobenzene on photoelectron kinetic energy. PHYSICAL REVIEW LETTERS 2003; 91:263002. [PMID: 14754048 DOI: 10.1103/physrevlett.91.263002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2003] [Indexed: 05/24/2023]
Abstract
Photoelectron angular distributions (PADs) have been measured following the excitation of the S1 origin band in paradifluorobenzene using a range of ionizing wavelengths and for resolved ion vibrational states. The PADs show a dramatic sensitivity to the photoelectron kinetic energy over an energy range of at least 1 eV from threshold, and almost no sensitivity to any prepared intermediate state alignment. This has important consequences for those studies of intramolecular dynamics that use PADs. We suggest that the observed behavior is caused by a shape resonance in the continuum.
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Affiliation(s)
- Susan M Bellm
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
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Abstract
Angle-resolved photoelectron spectroscopy has been performed for more than 70 years in various guises, but recently its potential to help solve in detail problems in the photoionization dynamics and intramolecular dynamics of gas-phase molecules has been recognized. One key development has been the design of experiments in appropriate geometries to extract information that pertains to the molecular frame, another has been the development of imaging spectrometers, and a third is the use of ultrafast lasers to cause photoionization. In this review, which is aimed at experimentalists, simple expressions for photoelectron angular distributions (PADs) in various experimental geometries are given and their applications explained.
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Affiliation(s)
- Katharine L Reid
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
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Powis I, Rennie EE, Hergenhahn U, Kugeler O, Bussy-Socrate R. Investigation of the Gas-Phase Amino Acid Alanine by Synchrotron Radiation Photoelectron Spectroscopy. J Phys Chem A 2002. [DOI: 10.1021/jp0266345] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ivan Powis
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K., Fritz-Haber Institut der Max Planck Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany, and Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany
| | - Emma E. Rennie
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K., Fritz-Haber Institut der Max Planck Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany, and Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany
| | - Uwe Hergenhahn
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K., Fritz-Haber Institut der Max Planck Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany, and Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany
| | - Oliver Kugeler
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K., Fritz-Haber Institut der Max Planck Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany, and Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany
| | - Reagan Bussy-Socrate
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K., Fritz-Haber Institut der Max Planck Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany, and Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany
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Hikosaka Y, Eland JHD, Watson TM, Powis I. Molecule frame photoelectron angular distributions from oriented methyl chloride and methyl fluoride molecules. J Chem Phys 2001. [DOI: 10.1063/1.1394750] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Davies JA, Continetti RE, Chandler DW, Hayden CC. Femtosecond time-resolved photoelectron angular distributions probed during photodissociation of NO2. PHYSICAL REVIEW LETTERS 2000; 84:5983-5986. [PMID: 10991104 DOI: 10.1103/physrevlett.84.5983] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2000] [Indexed: 05/23/2023]
Abstract
Femtosecond time-resolved photoelectron angular distributions (PADs) are measured for the first time in the molecular frame of a dissociating molecule. Various stages of the dissociation process, NO2-->NO(C Pi)+O(P), are probed using ionization of the NO(C Pi) fragment to NO+(X Sigma(+)). The PADs evolve from forward-backward asymmetric with respect to the dissociation axis at short time delays ( < or =500 fs) to symmetric at long time delays (> or = 1 ps). Changes in the PADs directly reflect the time-dependent separation and reorientation of the dissociating photofragments.
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Affiliation(s)
- J A Davies
- Combustion Research Facility, Sandia National Laboratories, P.O. Box 969, Livermore, California 94551-0969, USA
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Powis I. Photoelectron circular dichroism of the randomly oriented chiral molecules glyceraldehyde and lactic acid. J Chem Phys 2000. [DOI: 10.1063/1.480581] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Downie P, Powis I. The 5a1−1 photoionization of oriented CF3I molecules: Angular distributions of the ka1 and ke photoelectron continua. J Chem Phys 1999. [DOI: 10.1063/1.479215] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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