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Spectroscopy of XeF in Ar and Ne matrices G. Zerza, G. Sliwinski,a) N. Schwentner
 

Summary: Spectroscopy of XeF in Ar and Ne matrices
G. Zerza, G. Sliwinski,a) N. Schwentner
Institut ftir Experimentalphysik, Freie Universittit Berlin, Arnimallee 14, D 1419.5 Berlin, Germany
G. J. Hoffmanb) D. G. Imre,c) and V. A. Apkarian
Department of Chemistry, University of California, Irvine, California 92717
(Received 22 July 1993; accepted 19 August 1993)
Spectroscopic constants for the B 22+ and C211 charge transfer states of XeF in Ar and Ne
matrices are derived from vibrational progressions in excitation and emission spectra. Polariza-
tion effects on the T, values are discussed and Rittner potentials are fitted to the constants.
Emissions at 389 and 411 nm in Ne and Ar, respectively, are attributed to a distorted B state
denoted as B* with a strong red shift of T, and an about 30% larger w, . B* is assigned to a XeF
center with an additional F atom which can be a precursor to XeF2 according to a comparison
with Xe,F spectra and the concentration dependence of the intensities. The B* vibrational bands
display two well resolved tine structure progressions with a common o, of - 60 cm- 'in Ar and
Ne which is close to the maximum matrix phonon density and one with 30 cm-' in Ne and 15
cm -' in Ar. A reversible change in the Ne fine structure pattern with temperature can be
correlated to a face-centered-cubic-hexagonal close-packed (fee-hcp) phase transition.
1. INTRODUCTION
Laser applications stimulated intense experimental and
theoretical investigations of the rare gas halides, in general,

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine

 

Collections: Chemistry