| Numéro |
J. Phys. Colloques
Volume 48, Numéro C6, Novembre 1987
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
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| Page(s) | C6-27 - C6-31 | |
| DOI | https://doi.org/10.1051/jphyscol:1987605 | |
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
Institute of Experimental Physics, University of Wroclaw, 50-205 Wroclaw, Poland
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.