Interpretations of XeI and XeBr bound–free emission spectra and reactive quenching of Xe(3P2) atoms by bromine and iodine containing molecules

Abstract

Reactive quenching studies of Xe (6s,3 P 2) metastable atoms by chlorine containing molecules

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

“…In addition to the studies already discussed in some detail, there has been a considerable effort invested in understanding the bound-free B→X emission of XeBr observed under conditions where a large number of emitting ͑Ј, JЈ͒ levels contribute to the spectra, e.g., low-pressure flow-discharge, 34 resonance-sensitization, 12 and beam-gas experiments. 14 The spectra observed in such experiments often involve quite high Ј levels having wave functions that extend over a large range of R. Accordingly, simulating the B→X spectra requires information about not only the potentials but also the transition moment function ͑which varies too slowly with R to be of importance in the kind of trial- 41, after adjustment of the latter's internuclear distance R e to match observed intensities.…”

Multidimensional steric effect for the XeBr∗ (B, C) formation in the oriented Xe∗(P32, MJ=2)+oriented CF3Br reaction

“…22 Unfortunately, we cannot precisely determine the branching ratio ⌫ ͑B/C͒ in the present study. However, we can roughly estimate an analogous branching ratio of ⌫͑B / C͒ϳ1.5Ϯ 0.3 according to both the observed emission intensity ratio between the XeBr ‫ء‬ ͑B, C͒ channels through the bandpass filters at the random orientation condition and the transmittance data for the bandpass filters if we assume the same XeBr ‫ء‬ emission spectrum in Ref.…”

“…However, we can roughly estimate an analogous branching ratio of ⌫͑B / C͒ϳ1.5Ϯ 0.3 according to both the observed emission intensity ratio between the XeBr ‫ء‬ ͑B, C͒ channels through the bandpass filters at the random orientation condition and the transmittance data for the bandpass filters if we assume the same XeBr ‫ء‬ emission spectrum in Ref. 22 for the present study. It is expected that the difference in the experimental condition with the flowing afterglow gives little influence at least on the branching ratio ⌫ ͑B/C͒.…”

“…Therefore, we calibrated the relative intensity XeBr ‫ء‬ ͑B͒ / XeBr ‫ء‬ ͑C͒ by using the branching ratio ͑⌫͑B / C͒ = 1.4͒ reported in Ref. 22. Needless to say, the uncertainty of ⌫ ͑B/C͒ gives no influence on the shape of the molecular steric opacity function for each XeBr ‫ء‬ channel, and change only the relative intensity of the molecular steric opacity function between the XeBr ‫ء‬ ͑B, C͒ channels.…”

“…The nonclosed shell of Rg + gives rise to two different excited rare gas halide product states, RgX ‫ء‬ ͑B,⍀ =1/ 2͒ and RgX ‫ء‬ ͑C,⍀ =3/ 2͒, which correlate with Rg + ͑ 2 P 3/2 ͒ and X − ͑ 1 S 0 ͒. The RgX ‫ء‬ formation is known to proceed via the "harpoon" mechanism [22][23][24][25][26][27] such as the metal halide MX formation in the reaction of alkali-metal atoms M, for which steric effects have been widely studied using the oriented molecules. [1][2][3][4][5][6][7][8][9][10][11][12][13][16][17][18] For the KI formation in the K + CF 3 I reaction system, it has been reported that the molecular orientation exerts an influence on only the angular distribution of KI with the comparable reaction probability at the two ends.…”