Spectroscopic studies of diatomic noble gas halides. II. Analysis of bound-free emission from XeBr, XeI, and KrF

Abstract

Articles you may be interested inInterpretations of XeI and XeBr bound-free emission spectra and reactive quenching of Xe(3 P 2) atoms by bromine and iodine containing molecules Absorption and emission spectra of matrixisolated XeF, KrF, XeCl, and XeBrThe strong ultraviolet emission bands ("Spectrum I") of XeBr, XeI, and KrF have been photographed following electron-beam excitation of appropriate noble gas/halide mixtures at moderate to high pressures. These diffuse spectra are analyzed through trial-and-error theoretical simulations. The upper-state vibrational frequencies are estimated to be 120± 10, 112±8, and 31O±20 cm-I for XeBr, XeI, and KrF, respectively. The analysis also yields approximate shapes for the lower-state potential curves in the Franck-Condon region. Lasing is observed in XeBr (2818 A) and KrF (2484,2491 A) but not in Xel.

On the performance of an e-beam pumped KrF laser

“…A great deal of information on the most important processes has been published [5][6][7][8][9][10][11][12][13][14][15] and the data obtained by various authors are in good agreement with each other. One may conclude from the literature that the dominant formation, quenching and radiation absorption processes are well understood.…”

The B(1/2 2P3/2)→X(1/2 2Σ+) transition in XeBr

“…The earliest attempts at a quantitative analysis of this spectrum treated the transition as bound-free and employed trial-and-error quantum spectral simulations. 6 This analysis yielded an estimate of 120Ϯ10 cm Ϫ1 for the vibrational frequency e in the B state, which was 10% smaller than the theoretical estimate of 133 cm Ϫ1 . 17 In 1983 we noted fine violet-degraded structure in the B→X spectrum of XeBr.…”

“…2 The essential spectroscopic features of the RgX molecules were quickly understood in terms of models which likened their ion-pair excited electronic states to the analogous alkali halide ground states and treated their valence states as essentially unbound. 1,[3][4][5][6][7][8] The strongest emission observed in high-pressure discharges was attributed to the B( 1 2 2 P 3/2 )→X( 1 2 2 ⌺ ϩ ) transition, 9 and lasing was eventually achieved on this transition in all the RgF and RgCl species for RgϭXe, Kr, and Ar. From a practical standpoint the XeBr laser has been far less significant than its RgF and RgCl cousins.…”

Vibrational population distributions from rare gas halide spectra

“…Reactive scattering can yield excited electronic states of the rare gas halides through atom transfer, giving rise to the oscillatory chemiluminescence spectral continua typical of bound-free transitions [1,2] Rg(SP2,o) + RX ~, RgX* + R Rg+X+hv Inelastic scattering can promote electronic excitation of the molecular collision partner leading to sensitized molecular fluorescence or more commonly dissociation Rg(aP2, 0) + RX ~Rg + RX* > RX…”

“…Collisions of rare gas metastable atoms (Ar, Kr, Xe(SPz,0)) with halogens and halogen containing molecules have been much studied in the past few years and provide model systems for investigating non-adiabatic processes [1][2][3][4][5][6][7][8][9]. Reactive scattering can yield excited electronic states of the rare gas halides through atom transfer, giving rise to the oscillatory chemiluminescence spectral continua typical of bound-free transitions [1,2] Rg(SP2,o) + RX ~, RgX* + R Rg+X+hv Inelastic scattering can promote electronic excitation of the molecular collision partner leading to sensitized molecular fluorescence or more commonly dissociation Rg(aP2, 0) + RX ~Rg + RX* > RX…”