期刊
JOURNAL OF CHEMICAL PHYSICS
卷 142, 期 22, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4922208
关键词
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资金
- National Science Foundation
- University of Wisconsin-Madison
- U.S. Department of Energy, Office of Science, Chemical Sciences, Geosciences, and Biosciences Division [DE-AC02-06CH11357]
- U.S. National Science Foundation [CHE-1361031]
- Robert A. Welch Foundation of Houston, TX [F-1283]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1361031] Funding Source: National Science Foundation
Photoionization cross sections and partial ion yields of Xe and XeF2 from Xe 3d(5/2), Xe 3d(3/2), and F 1s subshells in the 660-740 eV range are compared to explore effects of the F ligands. The Xe 3d-is an element of f continuum shape resonances dominate the photoionization cross sections of both the atom and molecule, but prominent resonances appear in the XeF2 cross section due to nominal excitation of Xe 3d and F 1s electrons to the lowest unoccupied molecular orbital (LUMO), a delocalized anti-bonding MO. Comparisons of the ion products from the atom and molecule following Xe 3d photoionization show that the charge-state distribution of Xe ions is shifted to lower charge states in the molecule along with production of energetic F+ and F2+ ions. This suggests that, in decay of a Xe 3d core hole, charge is redistributed to the F ligands and the system dissociates due to Coulomb repulsion. The ion products from excitation of the F 1s-LUMO resonance are different and show strong increases in the yields of Xe+ and F+ ions. The subshell ionization thresholds, the LUMO resonance energies, and their oscillator strengths are calculated by relativistic coupled-cluster methods and agree well with measurements. (C) 2015 AIP Publishing LLC.
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