HBr Uptake on Ice:  Uptake Coefficient, H2O/HBr Hydrate Formation, and H2O Desorption Kinetics

HBr uptake on thin ice films was examined using laser-induced thermal desorption (LITD), temperature-programmed desorption (TPD) and Fourier transform infrared (FTIR) spectroscopy techniques. LITD was used to determine the uptake coefficient in situ during low HBr exposures as a function of HBr pres...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2001-02, Vol.105 (4), p.694-702
Main Authors: Hudson, P. K, Foster, K. L, Tolbert, M. A, George, S. M, Carlo, S. R, Grassian, V. H
Format: Article
Language:English
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Summary:HBr uptake on thin ice films was examined using laser-induced thermal desorption (LITD), temperature-programmed desorption (TPD) and Fourier transform infrared (FTIR) spectroscopy techniques. LITD was used to determine the uptake coefficient in situ during low HBr exposures as a function of HBr pressure and ice film temperature. The HBr uptake coefficient on ice was γ = 0.61 ± 0.06 at 140 K and γ = 0.24 ± 0.05 at 100 K at low HBr coverages for HBr pressures ranging from 3 × 10-8 to 1.4 × 10-7 Torr. TPD and FTIR were used to examine HBr uptake on ice at higher HBr exposures. TPD studies observed that thin ice films exposed to HBr at 140 K saturated with HBr after large exposures and formed an HBr hydrate with an H2O:HBr ratio of ∼3.6:1. FTIR measurements monitored the development of the H3O+ bending vibration versus HBr exposure on ice. Saturation of the integrated absorbance for this H3O+ bending vibration was observed after large HBr exposures. The uptake of HBr on ice also had a profound effect on H2O desorption from ice. H2O desorbed at higher temperatures in the presence of HBr. The zero-order kinetics for H2O desorption from pure ice were E d = 13.4 kcal mol-1 and ν0 = 1.9 × 1032 cm-2 s-1. The zero-order kinetics for H2O desorption from the HBr hydrate formed after saturation HBr exposures were E d = 10.6 kcal mol-1 and ν0 = 6.3 × 1027 cm-2 s-1.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp002700w