Negative ion photoelectron spectroscopy of the AsO{sup {minus}} anion
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218 (United States)
The negative ion photoelectron spectrum of AsO{sup {minus}} has been measured, assigned, and analyzed. The adiabatic electron affinity, EA{sub a}, was determined directly from the photoelectron spectrum. The dissociation energy of AsO{sup {minus}}, D{sub 0}(AsO{sup {minus}}), was computed via an energetic cycle using our measured value of EA{sub a} and existing literature values for other necessary quantities. Franck{endash}Condon analysis provided values for the bond length of the AsO{sup {minus}} anion, r{sub e}(AsO{sup {minus}}), its vibrational frequency, {omega}{sub e}(AsO{sup {minus}}), and its anharmonicity constant, {omega}{sub e}{chi}{sub e}(AsO{sup {minus}}). The values of the molecular constants which were determined in this work are: EA{sub a}(AsO)=1.286{plus_minus}0.008thinspeV, D{sub 0}(AsO{sup {minus}})=4.74{plus_minus}0.08eV, r{sub e}(AsO{sup {minus}})=1.696{plus_minus}0.010thinsp{Angstrom}, {omega}{sub e}(AsO{sup {minus}})=827{plus_minus}40thinspcm{sup {minus}1}, and {omega}{sub e}{chi}{sub e}(AsO{sup {minus}})=5.54thinspcm{sup {minus}1}. In addition, we determined the Xthinsp{sup 3}{Sigma}{sup {minus}}{minus}a{sup 1}{Delta}, ground-to-first excited state splitting in AsO{sup {minus}} to be {approximately}0.54 eV. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 664671
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 21 Vol. 109; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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