PHOTOABSORPTION UV SPECTROSCOPY OF X-B TRANSITION IN XcCI EXCIMER MOLECULE
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Date
1993
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The excitation spectrum owing to $XeCI(X,v\to B,v')$, photoabsorption, and $Xe +CI \to XeCI(B,v)$, photoassociation, transitions was obtained for the first time in a wide spectral range (276-315 nm). Having been irradiated by the XcCI-cxcimer laser, to obtain Cl atoms, the mixture of Xe (1-4 atm) and C12 (0.5.3 forr) was exposed to the pulse of tunable dye laser second harmonic. The following fluorescence on XcCI(C-A) transition (350 nm) as well as from triatomic Xc2CI excimer molecule (490 nm), formed in secondary, XcCI + 2Xe - Xe2CI + Xc, reaction has been observed. The spectrum consists of v-bands (up to $v=22$) with v* structure and the peaks positions are well-assigned with that observed in emission spectra. For the upper v values a pronounced isotopic. CI-CI, structure is clearly seen. The spectrum red wing, 310-315 nm, behavior shows some evidences for Xe2CI direct photochemical formation. The attempt to divide the contributions of photoabsorption and photoassociation proccsses has been undertaken and the estimate for the rate constant of photon-assisted two-body atomic recombination reaction has been accomplished. The spectrum obtained seems to be of interest for Franck-Condon factors calculations (since the populations of the initial XcCl(B,v) state v.J-sublvels being in equilibrium are well-determined) and for elucidation of the tunable XcCI-Iaser perspectives.
Description
Author Institution: Quantum systems Lab., Institute for Energy Problems of Chemical Physics.