THE LOW-LYING ELECTRONIC STATES OF THE RARE GAS OXIDES
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Date
1976
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Ohio State University
Abstract
Lasing has been observed on a nearly atomic O($^{1}$S)-O($^{1}$D) transition (5577 \AA) in argon-, krypton-, and xenon-oxygen mixtures and it has been attributed to a weakly bound rare gas monoxide. We report a brief summary of ab initio configuration Interaction calculations on all of the electronic states of RgO (Rg = Ne, Ar, Kr, and Xe) arising from the $Rg(^{1}S) + O(^{3}P, ^{1}D, and ^{1}S)$ limits. All states, with the exception of the $1 ^{1}\Sigma^{+}$ state, are found to be unbound (with at most van der Waals’ minima). The binding in the $1^{1}\Sigma^{+}$ state is due in large part to the incorporation of $Rg^{+}(^{2}P) + 0^{-}(^{2}P)$ character and increases in the series: Ne(unbound) to Ar(essentially flat) to Kr(bound) to Xe(bound). The admixture of ionic character in the $1^{1}\Sigma^{+}$ state also strongly enhances the $2^{1}\Sigma^{+}-1^{1}\Sigma^{+}$ transition.
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$^{1}$J. L. Pritchard, unpublished work (1972); N. H. Brooks, private communication (1975). $^{2}$In particular associated with the OAO Copernicus satellite program at the Princeton University Observatory.
Author Institution: Los Alamos Scientific Laboratory, University of California
Author Institution: Los Alamos Scientific Laboratory, University of California