| 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) | C6-551 - C6-556 | |
| DOI | https://doi.org/10.1051/jphyscol:1987690 | |
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
J. Phys. Colloques 48 (1987) C6-551-C6-556
DOI: 10.1051/jphyscol:1987690
Institute of Experimental Physics, University of WrocŽaw, ul. Cybulskiego 36, 50-205 WrocŽaw, Poland
J. Phys. Colloques 48 (1987) C6-551-C6-556
DOI: 10.1051/jphyscol:1987690
SULFUR SPREADING OVER A NICKEL FIELD EMITTER SURFACE
M. BŽaszczyszynowa, R. BŽaszczyszyn et R. MåclewskiInstitute of Experimental Physics, University of WrocŽaw, ul. Cybulskiego 36, 50-205 WrocŽaw, Poland
Abstract
Sequences of field emission patterns corresponding to successive stages of the sulfur adsorption on the nickel emitter at 550, 700 and 1000 K are presented and discussed. It was found that : (i) the sulfur adsorbed at 700 and 1000 K is spread over the entire emitter tip contrary to the adsorption at 550 K when accumulation of sulfur is observed in some regions ; (ii) sulfur clusters visible at 550 and 700 K can be partly responsible for the observed poor reproducibility of the dependence of the average work function change vs the deposition time ; (iii) at 1000 K the penetration of sulfur atoms into the nickel surface occurs.