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Proceedings Paper

Surface probes of porous toluene/water ices: adsorption kinetics and annealing spectra measured by second-harmonic generation
Author(s): Bryan Fayne Henson; Jeanne M. Robinson
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Paper Abstract

We have applied the technique of second harmonic generation to the study of the solid/vapor interface of porous toluene/water ice films at low temperature. The ice samples are condensed from the vapor onto a cold support at 90 K and are typically approximately 500 micrometers thick with an internal surface area of approximately 200 m2. The ices are transparent to both the 532 nm probe laser and to the 266 nm second harmonic signal. Second harmonic light is generated from surfaces throughout the bulk of the porous sample. Significant differences in the efficiency for second harmonic generation from water and toluene enable the species specific study of annealing and adsorption in this binary system. Measurements of the coverage dependent adsorption of toluene on water ice, and the observation of a coverage dependent liquid-solid phase transition in a few monolayers of toluene adsorbed on water ice at temperatures below the bulk toluene melting temperature are presented.

Paper Details

Date Published: 21 July 1994
PDF: 10 pages
Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); doi: 10.1117/12.180835
Show Author Affiliations
Bryan Fayne Henson, Los Alamos National Lab. (United States)
Jeanne M. Robinson, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2125:
Laser Techniques for Surface Science
Hai-Lung Dai; Steven J. Sibener, Editor(s)

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