THE LOW-LYING STATES OF $Ar_{2}F$
Loading...
Date
1977
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Excitation of $Ar/Kr/F_{2}$ mixtures has produced broad emission bands at 400 and 290 nm that have been assigned to $Kr_{2}F$ and $Ar_{2}F.^{1}$ Large basis set configuration interaction calculations have been performed on six low-lying states of $Ar_{2}F$ in order to elucidate the observed spectra and make definite state assignments. The six lowest states consist of three repulsive covalent states and three attractive ionic states $(Ar_{2}^{+}F^{-})$. The ionic states favor isosceles triangle geometries over linear geometries. However, only one ionic state $(2^{2}B_{2})$ is bound (by 0.60 eV) relative to $Ar^{+}F^{-} + $Ar. The wavelengths for the $2^{2}B_{2} \rightarrow 1^{2}A_{1}$ and $2^{2}B_{2} \rightarrow 1^{2}B_{2}$ transitions are calculated to be 268 and 274 nm, respectively, which compares favorably with experiment (290 nm). The calculated lifetimes for the two transitions are both long, 245 $ns(2^{2}B_{2} \rightarrow 1^{2}A_{1})$ and 269 $ns(2^{2}B_{2} \rightarrow 1^{2}B_{2})$. The implications of these results for the kinetics of ArF and KrF lasers will be considered briefly.
Description
$^{1}$ H. H. Nakano, R. M. Hill, D. C. Lorents, D. L. Huestis, and M. V. McCusker, Final Technical Report, SRI No. MP 76-99, Stanford Research Institute, December 1976.
Author Institution: Theoretical Division, Los Alamos Scientific Laboratory
Author Institution: Theoretical Division, Los Alamos Scientific Laboratory