Control of amorphous solid water morphology using molecular beams. I. Experimental results

Details Control of amorphous solid water morphology using molecular beams. I. Experimental results Control of amorphous solid water morphology using molecular beams. I. Experimental results

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jchph.114.5284k&link_type=abstract

Journal of Chemical Physics, Volume 114, Issue 12, pp. 5284-5294 (2001).

Other

86

Adsorbate Structure, Impurity And Defect Levels, Energy States Of Adsorbed Species, Structure And Morphology, Thickness, Crystalline Orientation And Texture, Other Nonelectronic Physical Properties

Scientific paper

The adsorption of N2 was used to investigate the porosity/morphology of thin films of amorphous solid water. Molecular beams were used to vapor deposit amorphous solid water films on a Pt(111) crystal at a variety of incident growth angles. The amount of N2 adsorbed by the amorphous solid water depends very sensitively on the growth angle and thermal history of the film. For normal and nearly normal incidence growth, the water films are relatively dense and smooth and adsorb only a small amount of N2. For larger growth angles, the films are porous and adsorb large quantities of N2 with apparent surface areas as high as ~2700 m2/g. The physical and chemical properties of amorphous solid water are of interest because of its presence in astrophysical environments. The observations have important implications for laboratory studies which use vapor deposited amorphous solid water films as analogs for astrophysical icy bodies such as comets.

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