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Ionization-site effects on the photofragmentation of chloro- and bromoacetic acid molecules

Levola, Helena; Itala, Eero; Schlesier, Kim; Kooser, Kuno; Laine, Sanna; Laksman, Joakim LU ; Trinh Ha, Dang; Rachlew, Elisabeth; Tarkanovskaja, Marta and Tanzer, Katrin, et al. (2015) In Physical Review A (Atomic, Molecular and Optical Physics) 92(6).
Abstract
Fragmentation of gas-phase chloro-and bromoacetic acid samples, particularly its dependency on the atomic site of the initial core ionization, was studied in photoelectron-photoion-photoion coincidence (PEPIPICO) measurements. The fragmentation was investigated after ionizing carbon 1s and bromine 3d or chlorine 2p core orbitals. It was observed that the samples had many similar fragmentation pathways and that their relative weights depended strongly on the initial ionization site. Additional Auger PEPIPICO measurements revealed a clear dependence of fragment pair intensities on the kinetic energy of the emitted Auger electrons. The modeled and measured Auger electron spectra indicated that the average internal energy of the molecule was... (More)
Fragmentation of gas-phase chloro-and bromoacetic acid samples, particularly its dependency on the atomic site of the initial core ionization, was studied in photoelectron-photoion-photoion coincidence (PEPIPICO) measurements. The fragmentation was investigated after ionizing carbon 1s and bromine 3d or chlorine 2p core orbitals. It was observed that the samples had many similar fragmentation pathways and that their relative weights depended strongly on the initial ionization site. Additional Auger PEPIPICO measurements revealed a clear dependence of fragment pair intensities on the kinetic energy of the emitted Auger electrons. The modeled and measured Auger electron spectra indicated that the average internal energy of the molecule was larger following the carbon 1s core-hole decay than after the decay of the halogen core hole. This difference in the internal energies was found to be the source of the site-dependent photofragmentation behavior. (Less)
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publication status
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Physical Review A (Atomic, Molecular and Optical Physics)
volume
92
issue
6
publisher
American Physical Society (APS)
external identifiers
  • wos:000366083100008
  • scopus:84950111139
ISSN
1050-2947
DOI
10.1103/PhysRevA.92.063409
language
English
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yes
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94f534dc-7468-4352-aa51-7b9b38dd26e6 (old id 8556944)
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2016-01-26 13:36:43
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2017-01-01 03:40:32
@article{94f534dc-7468-4352-aa51-7b9b38dd26e6,
  abstract     = {Fragmentation of gas-phase chloro-and bromoacetic acid samples, particularly its dependency on the atomic site of the initial core ionization, was studied in photoelectron-photoion-photoion coincidence (PEPIPICO) measurements. The fragmentation was investigated after ionizing carbon 1s and bromine 3d or chlorine 2p core orbitals. It was observed that the samples had many similar fragmentation pathways and that their relative weights depended strongly on the initial ionization site. Additional Auger PEPIPICO measurements revealed a clear dependence of fragment pair intensities on the kinetic energy of the emitted Auger electrons. The modeled and measured Auger electron spectra indicated that the average internal energy of the molecule was larger following the carbon 1s core-hole decay than after the decay of the halogen core hole. This difference in the internal energies was found to be the source of the site-dependent photofragmentation behavior.},
  articleno    = {063409},
  author       = {Levola, Helena and Itala, Eero and Schlesier, Kim and Kooser, Kuno and Laine, Sanna and Laksman, Joakim and Trinh Ha, Dang and Rachlew, Elisabeth and Tarkanovskaja, Marta and Tanzer, Katrin and Kukk, Edwin},
  issn         = {1050-2947},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society (APS)},
  series       = {Physical Review A (Atomic, Molecular and Optical Physics)},
  title        = {Ionization-site effects on the photofragmentation of chloro- and bromoacetic acid molecules},
  url          = {http://dx.doi.org/10.1103/PhysRevA.92.063409},
  volume       = {92},
  year         = {2015},
}