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Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule

Kivimaki, A.; Sankari, Anna LU ; Kettunen, J. A.; Stråhlman, Christian LU ; Ruiz, J. Alvarez and Richter, R. (2015) In Journal of Chemical Physics 143(11).
Abstract
We have studied the production of neutral high-Rydberg (HR) fragments from the CH4 molecule at the C 1s -> 3p excitation and at the C 1s ionization threshold. Neutral fragments in HR states were ionized using a pulsed electric field and the resulting ions were mass-analyzed using an ion time-of-flight spectrometer. The atomic fragments C(HR) and H(HR) dominated the spectra, but molecular fragments CHx(HR), x = 1-3, and H-2(HR) were also observed. The production of HR fragments is attributed to dissociation of CH4+ and CH42+ ions in HR states. Just above the C 1s ionization threshold, such molecular ionic states are created when the C 1s photoelectron is recaptured after single or double Auger decay. Similar HR states may be reached... (More)
We have studied the production of neutral high-Rydberg (HR) fragments from the CH4 molecule at the C 1s -> 3p excitation and at the C 1s ionization threshold. Neutral fragments in HR states were ionized using a pulsed electric field and the resulting ions were mass-analyzed using an ion time-of-flight spectrometer. The atomic fragments C(HR) and H(HR) dominated the spectra, but molecular fragments CHx(HR), x = 1-3, and H-2(HR) were also observed. The production of HR fragments is attributed to dissociation of CH4+ and CH42+ ions in HR states. Just above the C 1s ionization threshold, such molecular ionic states are created when the C 1s photoelectron is recaptured after single or double Auger decay. Similar HR states may be reached directly following resonant Auger decay at the C 1s -> 3p resonance. The energies and geometries of the parent and fragment ions have been calculated in order to gain insight into relevant dissociation pathways. (C) 2015 AIP Publishing LLC. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
143
issue
11
publisher
American Institute of Physics
external identifiers
  • pmid:26395703
  • wos:000361843900028
  • scopus:84942162909
ISSN
0021-9606
DOI
10.1063/1.4931105
language
English
LU publication?
yes
id
015930b4-e47a-49f5-ac7a-05f709c7105f (old id 8062361)
date added to LUP
2015-10-21 09:25:39
date last changed
2017-01-01 03:35:52
@article{015930b4-e47a-49f5-ac7a-05f709c7105f,
  abstract     = {We have studied the production of neutral high-Rydberg (HR) fragments from the CH4 molecule at the C 1s -> 3p excitation and at the C 1s ionization threshold. Neutral fragments in HR states were ionized using a pulsed electric field and the resulting ions were mass-analyzed using an ion time-of-flight spectrometer. The atomic fragments C(HR) and H(HR) dominated the spectra, but molecular fragments CHx(HR), x = 1-3, and H-2(HR) were also observed. The production of HR fragments is attributed to dissociation of CH4+ and CH42+ ions in HR states. Just above the C 1s ionization threshold, such molecular ionic states are created when the C 1s photoelectron is recaptured after single or double Auger decay. Similar HR states may be reached directly following resonant Auger decay at the C 1s -> 3p resonance. The energies and geometries of the parent and fragment ions have been calculated in order to gain insight into relevant dissociation pathways. (C) 2015 AIP Publishing LLC.},
  articleno    = {114305},
  author       = {Kivimaki, A. and Sankari, Anna and Kettunen, J. A. and Stråhlman, Christian and Ruiz, J. Alvarez and Richter, R.},
  issn         = {0021-9606},
  language     = {eng},
  number       = {11},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule},
  url          = {http://dx.doi.org/10.1063/1.4931105},
  volume       = {143},
  year         = {2015},
}