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Title: Photoabsorption, photoionization, and Auger processes at the carbon K edge in C H 3 I

Journal Article · · Physical Review A
 [1];  [2];  [3];  [4];  [4];  [4];  [5]; ORCiD logo [6]
  1. Univ. College London, London (United Kingdom); Univ. of Ottawa, Ottawa, ON (Canada)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. European X-ray Free-Electron Laser (XFEL), Schenefeld (Germany)
  4. Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette (France)
  5. Univ. of Nottingham (United Kingdom)
  6. 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; Engineering and Physical Sciences Research Council (EPSRC); United Kingdom Science and Technology Facilities Council
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1607442
Alternate ID(s):
OSTI ID: 1599682
Journal Information:
Physical Review A, Vol. 101, Issue 2; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (49)

Carbon 1s photoelectron spectroscopy of the chlorinated methanes: Lifetimes and accurate vibrational lineshape models journal September 2012
Roadmap of ultrafast x-ray atomic and molecular physics journal January 2018
Auger spectra of alkanes journal November 1980
Self-consistent-field calculations of core excited states journal March 2009
An experimental and theoretical study of the C 1s ionization satellites in CH 3 I journal June 2019
Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses journal March 2016
Auger electron angular distributions following excitation or ionization of the I 3d level in methyl iodide journal September 2018
Chemical‐state effects in Auger electron spectroscopy journal August 1978
Femtosecond response of polyatomic molecules to ultra-intense hard X-rays journal May 2017
The C 1s Auger decay spectrum of the molecule: the effects of vibrational fine structure, double excitations and shake-up transitions journal July 1996
Energy partitioning following photodissociation of methyl iodide in the A band: A velocity mapping study journal January 1999
A detailed experimental and theoretical study of the femtosecond A-band photodissociation of CH3I journal June 2008
Time dependent density functional theory of core electrons excitations journal May 2003
Inner shell excitation of CH 3F, CH 3Cl, CH 3Br and CH 3I by 2.5 keV electron impact journal January 1978
The Auger electron spectrum of water vapour journal September 1975
Photodissociation Dynamics book January 2009
A new hybrid exchange–correlation functional using the Coulomb-attenuating method (CAM-B3LYP) journal July 2004
Spin–orbit effects, electronic decay and breakdown phenomena in the photoelectron spectra of iodomethane journal October 2012
Carbon 1 s core-hole lifetime in CO 2 journal March 2000
Angle-resolved electron spectroscopy of the resonant Auger decay in xenon with meV energy resolution journal July 2011
Auger Electron Spectra of Molecules: The First Row Hydrides journal January 1990
X-ray Pump–Probe Investigation of Charge and Dissociation Dynamics in Methyl Iodine Molecule journal May 2017
Photoionization of the iodine 3d, 4s, and 4p orbitals in methyl iodide journal October 2018
Augmented Gaussian basis sets for the elements K, Sc–Kr, Rb, and Y–Xe: Application in HF, MP2, and DFT calculations of molecular electric properties journal June 2013
Theoretical analysis of the Auger spectra of C H 4 journal May 1975
Carbon 1 s photoelectron spectrum of methane: Vibrational excitation and core-hole lifetime journal May 1999
Rydberg—valence mixing in the C 1s excited states of CH4 probed by electron spectroscopy journal April 1995
Carbon 1s photoelectron spectroscopy of CF4 and CO: Search for chemical effects on the carbon 1s hole-state lifetime journal June 2002
A study of the photoionisation dynamics of chloromethane and iodomethane journal August 2006
Resolution and signal‐to‐background enhancement in gas‐phase electron spectroscopy journal August 1993
On the assignment of the carbon K-shell spectra of the methyl halides journal January 1979
Valence double ionization electron spectra of CH 3 F, CH 3 Cl and CH 3 I journal July 2017
Electronic-state interference in the C 1 s excitation and decay of methyl chloride studied by angularly resolved Auger spectroscopy journal November 2017
Coulomb explosion imaging of CH 3 I and CH 2 ClI photodissociation dynamics journal November 2018
Brighter and faster: The promise and challenge of the x-ray free-electron laser journal July 2015
Time‐dependent dynamics of methyl iodide photodissociation in the first continuum journal July 1990
Analysis of valence XPS and AES of C, N, O, and F-containing substances by DFT calculations using the model molecules journal May 2015
Excited fragments from excited molecules: energy partitioning in the photodissociation of alkyl iodides journal January 1972
The resonant Auger effect journal January 2000
Methyl rotation, vibration, and alignment from a multiphoton ionization study of the 266 nm photodissociation of methyl iodide journal April 1989
The Ultimate X-ray Machine journal December 2013
Dynamics of the A-band ultraviolet photodissociation of methyl iodide and ethyl iodide via velocity-map imaging with ‘universal’ detection journal January 2015
Double photoionisation spectra of HI, CH3I and CF3I from TOF-PEPECO measurements journal March 2005
The influence of the bromine atom Cooper minimum on the photoelectron angular distributions and branching ratios of the four outermost bands of bromobenzene journal October 2015
Photodissociation of aligned CH 3 I and C 6 H 3 F 2 I molecules probed with time-resolved Coulomb explosion imaging by site-selective extreme ultraviolet ionization journal January 2018
Quantum theory of post-collision interaction in inner-shell photoionization: Final-state interaction between two continuum electrons journal December 1987
Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields journal November 1994
Vibrational structure of the chloromethane series, CH4−nCln, studied by core photoelectron spectroscopy and ab initio calculations journal March 1999
Direct Observation of the Transition-State Region in the Photodissociation of CH 3 I by Femtosecond Extreme Ultraviolet Transient Absorption Spectroscopy journal December 2015

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