| Numéro |
J. Phys. Colloques
Volume 50, Numéro C8, Novembre 1989
36th International Field Emission Symposium
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|---|---|---|
| Page(s) | C8-291 - C8-296 | |
| DOI | https://doi.org/10.1051/jphyscol:1989849 | |
J. Phys. Colloques 50 (1989) C8-291-C8-296
DOI: 10.1051/jphyscol:1989849
FIM OBSERVATION OF MONOLAYER Pd ADSORBED ON W AND Mo SURFACES
K. OKUNO et H. KIMDepartment of Electrical Engineering, Nagasaki Institute of Applied Science 536 Abamachi, Nagasaki 851-01, Japan
Abstract
Field ion microscopic observation of the monolayer Pd adsorbed on the W and Mo substrate surfaces has been investigated. The adsorbed structure of the observed monolayer Pd was found to be a pseudomorph on (011) and (112) planes, respectively. The pseudomorphic structure on the Mo(011) and (112) planes was also formed even at liquid nitrogen temperature. The desorption field strengths of the monolayer Pd are extremely higher than that of the evaporation field of bulk Pd, and are close to the evaporation field strengths of the substrate surfaces. Field desorption behavior in submonolayer level differs on the W(011) and Mo(011) planes. Although the adsorbed Pd on the Mo(011) plane was found isolated atomic arrangement, no such atomic behavior is observed in Pd/W(011) system. These results seem that the substrate effect is intrinsic.