Chlorine interactions with water ice studied by molecular beam techniques
Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 110, Issue: 46, Page: 23497-23501
2006
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Article Description
The kinetics of chlorine interactions with ice at temperatures between 103 and 165 K have been studied using molecular beam techniques. The Cl trapping probability is found to be unity at thermal incident energies, and trapping is followed by rapid desorption. The residence time on the surface is less than 25 μs at temperatures above 135 K and approaches 1 s around 100 K. Rate constants for desorption are determined for temperatures below 135 K. The desorption kinetics follow the Arrhenius equation, and activation energies of 0.24 ± 0.03 and 0.31 ± 0.01 eV, with corresponding preexponential factors of 10 and 10 s, are determined. At least two different Cl binding sites are concluded to exist on the ice surface. The observed activation energies are likely to be the Cl-ice binding energies for these states, and the Cl-surface interactions are concluded to be stronger than earlier theoretical estimates. The surface coverage of Cl on ice under stratospheric conditions is estimated to be negligible, in agreement with earlier work. © 2006 American Chemical Society.
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