Auger electron angular distributions following excitation or ionization of the I 3d level in methyl iodide

Forbes, Ruaridh; De Fanis, Alberto; Bomme, Cédric; Rolles, Daniel; Pratt, Stephen T.; Powis, Ivan; Besley, Nicholas A.; Nandi, Saikat; Milosavljević, Aleksandar R.; Nicolas, Christophe; Bozek, John D.; Underwood, Jonathan G.; Holland, David M.  P.

doi:10.1063/1.5045640

Title: Auger electron angular distributions following excitation or ionization of the I 3d level in methyl iodide

Journal Article · Thu Sep 06 00:00:00 EDT 2018 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.5045640· OSTI ID:1477729

Forbes, Ruaridh ^[1]; De Fanis, Alberto ^[2]; Bomme, Cédric ^[3];

^[4]; Pratt, Stephen T. ^[5];

^[6];

^[6]; Nandi, Saikat ^[7];

^[7]; Nicolas, Christophe ^[7]; Bozek, John D. ^[7]; Underwood, Jonathan G. ^[8]; Holland, David M. P. ^[9]

Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom; Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada
European XFEL, GmbH, Holzkoppel 14, 22869 Schenefeld, Germany
Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, United Kingdom

Auger electron spectra following excitation or ionization of the I 3d level in CH₃I have been recorded with horizontally or vertically plane polarized synchrotron radiation. These spectra have enabled the Auger electron angular distributions, as characterized by the β parameter, to be determined. The I 3d photoionization partial cross section of CH₃I has been calculated with the continuum multiple scattering approach, and the results show that in the photon energy range over which Auger spectra were measured, the I 3d cross section exhibits an atomic-like behavior and is dominated by transitions into the εf continuum channel. In this limit, the theoretical value of the alignment parameter (A₂₀) characterizing the core ionized state in an atom becomes constant, independent of photon energy. This theoretical value has been used to obtain the Auger electron intrinsic anisotropy parameters (α₂) from the β parameters extracted from our normal (non-resonant) molecular Auger spectra. The resulting anisotropy parameters for the M₄₅N₄₅N₄₅ transitions in CH₃I have been compared to those calculated for the corresponding transitions in xenon, and the experimental and theoretical results are in good agreement. Anisotropy parameters have also been measured for the M₄₅N₁N₄₅, M₄₅N₂₃N₄₅, and M₄₅N₄₅O₂₃ transitions. For the M₄₅N₁N₄₅ and M₄₅N₂₃N₄₅ Auger decays in CH₃I, the experimentally derived angular distributions do not exhibit the strong dependence on the final ionic state that is predicted for these transitions in xenon. Resonantly excited Auger spectra have been recorded at 620.4 and 632.0 eV, coinciding with the I 3d_5/2 → σ* and 3d_3/2 → σ* transitions, respectively. The resulting Auger electron angular distributions for the M₄N₄₅N₄₅ and M₅N₄₅N₄₅ decays were found to exhibit a higher anisotropy than those for the normal process. This is due to the larger photo-induced alignment in the neutral core excited state. For a particular Auger transition, the Auger electron kinetic energy measured in the resonantly excited spectrum is higher than that in the normal spectrum. This shift, due to the screening provided by the electron excited into the σ* orbital, has been rationalized by calculating orbital ionization energies of I 3d excited and I 3d ionized states in CH₃I.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; United Kingdom Science and Technology Facilities Council (STFC)

Grant/Contract Number:: AC02-06CH11357; FG02-86ER1349; EP/N002148/1

OSTI ID:: 1477729

Alternate ID(s):: OSTI ID: 1468876

Journal Information:: Journal of Chemical Physics, Vol. 149, Issue 9; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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