Atomic and Molecular Photoelectron and Auger Electron SpectroscopyStudies Using Synchrotron Radiation
- Univ. of California, Berkeley, CA (United States)
Electron spectroscopy, combined with synchrotron radiation, was used to measure the angular distributions of photoelectrons and Auger electrons from atoms and molecules as functions of photon energy. The branching ratios and partial cross sections were a 130 measured in certain cases. By comparison with theoretical calculations, the experimental results are interpreted in terms of the characteristic electronic structure and ionization dynamics of the atomic or molecular sample. The time structure of the synchrotron radiation source was used to record time-of-flight (TOF) spectra o f the ejected electrons. The ''a double-angle-TOF'' method for the measurement of photoelectron angular distributions is discussed. This technique offers the advantages of increased electron collect ion efficiency and the elimination of certain systematic errors. Several results were obtained for Xe using photon energies in the range hv ≃ 60-190 eV, where excitation and ionization of the inner-subshell 4d electrons dominates. The 4d asymmetry parameter {beta} exhibits strong oscillations with energy, in agreement with several theoretical calculations. As predicted, the 5p asymmetry parameter was observed to deviate strongly from that calculated using the independent-electron model, due to intershell correlation with the 4d electrons.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- DOE Contract Number:
- AC02-05CH11231; W-7405-ENG-48
- OSTI ID:
- 898925
- Report Number(s):
- LBL--13512
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY
ATOMS
AUGER ELECTRON SPECTROSCOPY
BRANCHING RATIO
CROSS SECTIONS
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELECTRONS
EXCITATION
IONIZATION
OSCILLATIONS
PHOTONS
SPECTRA
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES