Accession Number : ADA133383

Title :   Effect of UV Illumination on the Sublimation of Basal Surfaces of Zinc Oxide.

Descriptive Note : Technical rept. Jul 76-Jul 77,


Personal Author(s) : Carey,D A ; Rapp,R A ; Hirth,J P

PDF Url : ADA133383

Report Date : Nov 1983

Pagination or Media Count : 11

Abstract : Despite substantial agreement in the measured kinetics for the sublimation of basal surfaces of zinc oxide crystals, differing mechanisms have been proposed. To help resolve the questions, the effect of photoexcitation on the Zn0 basal plane sublimation rate was studied. Single crystals were illuminated by ultra-violet irradiation of 0.177 mW/sq mm, or 4 photons/site-sec. Three wave lengths between 300-375 nm gave the same result, i.e., a small decrease in rate for the (0001) surface, and a small increase for the (0001) surface. This result supports the model for surface charge effects resulting from oppositely charged surface kinks by Hirth et al, and opposes the model for rate control by charge recombination at surface sites by Kirschwald et al.

Descriptors :   *Zinc oxides, *Illumination, *Sublimation, Single crystals, Irradiation, Ultraviolet radiation, Rates, Surface reactions, Sites

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE