Accession Number : AD0761410

Title :   The Field Ion Microscopy of Gold. I. Hydrogen Promoted Field Evaporation - Experimental Results,

Corporate Author : CORNELL UNIV ITHACA N Y MATERIALS SCIENCE CENTER

Personal Author(s) : Ast,D. G. ; Seidman,D. N.

Report Date : 24 FEB 1970

Pagination or Media Count : 42

Abstract : A systematic study of the effect of hydrogen gas on the field evaporation characteristics of gold field ion microscope (FIM) specimens has been performed. The dependence of the field evaporation rate on hydrogen gas pressure, tip temperature, electric field strength, and time has been measured for the central axially symmetric (001) plane. There was no value of electric field strength at which FIM images of gold specimens were stable in the presence of hydrogen gas. Electron microscope observations of the hydrogen etched specimens indicated that the radius of curvature on the (001) region has a tendency to blunt, and that this tendency increased with increased hydrogen promoted field evaporation and temperature. (Modified author abstract)

Descriptors :   (*GOLD, *ELECTRON MICROSCOPY), FIELD EMISSION, HYDROGEN, EVAPORATION, ETCHING

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE