Photoabsorption, photoionization, and Auger processes at the carbon K edge in CH3I

Forbes, Ruaridh; Pratt, Stephen T.; De Fanis, Alberto; Milosavljević, Aleksandar R.; Nicolas, Christophe; Bozek, John D.; Besley, Nicholas A.; Holland, David M.  P.

doi:10.1103/PhysRevA.101.023408

Title: Photoabsorption, photoionization, and Auger processes at the carbon $K$ edge in $C H_{3} I$

Journal Article · 14 February 2020 · Physical Review A

DOI: https://doi.org/10.1103/PhysRevA.101.023408 · OSTI ID:1607442

Forbes, Ruaridh ^[1]; Pratt, Stephen T. ^[2]; De Fanis, Alberto ^[3]; Milosavljević, Aleksandar R. ^[4]; Nicolas, Christophe ^[4]; Bozek, John D. ^[4]; Besley, Nicholas A. ^[5];

^[6]

Univ. College London, London (United Kingdom); Univ. of Ottawa, Ottawa, ON (Canada)
Argonne National Lab. (ANL), Lemont, IL (United States)
European X-ray Free-Electron Laser (XFEL), Schenefeld (Germany)
Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette (France)
Univ. of Nottingham (United Kingdom)
Daresbury Lab., Warrington, Cheshire (United Kingdom)

The dynamics of photoabsorption, photoionization, and the associated Auger decay have been investigated at the carbon K edge in methyl iodide (CH₃I) using linearly polarized synchrotron radiation. Ion yield measurements were used to investigate transitions in the pre-edge region due to excitations into either unoccupied valence or Rydberg states. The assignment of these transitions was achieved through comparison with theoretical x-ray absorption spectra calculated using time-dependent density functional theory, within the Tamm-Dancoff approximation. Several of the Rydberg states belonging to series converging onto the C1s ionization limit exhibit significant vibrational structure that is also interpreted using theoretical calculations. The C1s in CH₃I photoelectron spectrum was measured, and the observed vibrational structure was assigned with the aid of theoretical predictions. Polarization dependent, resonantly excited, valence shell photoelectron spectra were recorded at photon energies coinciding with the C1s → σ*, C1s → 6sa1 and C1s → 6pe transitions in CH₃I , thereby allowing photoelectron angular distributions to be determined. The nonresonantly excited C(KVV) Auger electron spectrum was measured and some of the features observed at high kinetic energies were attributed to transitions into valence orbitals possessing significant iodine character. The contributions of participator and spectator Auger decay to the resonantly excited photoelectron spectra have been assessed. The influence of participator decay appears minor whereas spectator decay results in the enhanced population of satellite states.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; Engineering and Physical Sciences Research Council (EPSRC); United Kingdom Science and Technology Facilities Council

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1607442

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 101; ISSN PLRAAN; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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