34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
J. Phys. Colloques 48 (1987) C6-27-C6-31
DOI: 10.1051/jphyscol:1987605
STUDY OF LANTHANUM ON TUNGSTEN FIELD EMITTER - II
G. Kozlowski et S. SurmaInstitute of Experimental Physics, University of Wroclaw, 50-205 Wroclaw, Poland
Abstract
The adsorption and surface diffusion of lanthanum on a surface of a single crystal of tungsten was investigated at a low coverage. The average work function passes through a minimum of about 4 eV with increasing deposition time. A value of activation energy for the diffusion of lanthanum surveyed on the vicinals of the W(111) plane has been found to be 2.9 ± 0.4 eV and it drops to 1.18 ± 0.1 eV for the diffusion observed in an applied electric field.