Generalized oscillator strengths for some higher valence-shell excitations of argon

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.032701· OSTI ID:20982321

Zhu, Lin-Fan; Yuan, Hui; Jiang, Wei-Chun; Zhang, Fang-Xin; Yuan, Zhen-Sheng; Cheng, Hua-Dong; Xu, Ke-Zun ^[1]

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1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)

The valence shell excitations of argon were investigated by an angle-resolved fast-electron energy-loss spectrometer at an incident electron energy of 2500 eV, and the transition multipolarities for the excitations of 3p{yields}3d, 4d, 5s, and 5p were elucidated with the help of the calculated intermediate coupling coefficients using the COWAN code. The generalized oscillator strengths for the excitations to 3p{sup 5}(3d,3d{sup '}), 3p{sup 5}(5p,5p{sup '}), and 3p{sup 5}(5s,4d) were measured, and the profiles of these generalized oscillator strength were analyzed. Furthermore, although the present experimental positions of the maxima for the electric-monopole and electric-quadrupole excitations in 3p{yields}5p are in agreement with the theoretical calculations [Amusia et al., Phys. Rev. A 67, 022703 (2003)], the generalized oscillator strength profiles show obvious differences. In addition, the experimental generalized oscillator strength ratios for the electric-octupole transitions in 3p{yields}3d are different from the theoretical prediction calculated by the COWAN code.

• OSTI ID: 20982321
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ELECTRIC CHARGES
ELECTRON-ATOM COLLISIONS
ELECTRONIC STRUCTURE
ELECTRONS
ENERGY LOSSES
ENERGY-LOSS SPECTROSCOPY
EXCITATION
FORECASTING
INTERMEDIATE COUPLING
KEV RANGE 01-10
OSCILLATOR STRENGTHS
QUADRUPOLES
SPECTROMETERS
VALENCE