Abstract
Platinum vapor was deposited on a tungsten surface in ultra-high vacuum. After the rather irregular spreading of one or two monolayers over the surface, platinum atoms crystallized on some flat planes in a so-called island manner. This may be due to the cohesive tendency of platinum atoms themselves. The temperature of the tungsten (substrate) was kept below about 250°K. The arrangement of atoms in these islands had some relation to the crystallographic planes of the substrate. Stacking and size of the islands were observed using a fleld-desorption technique. There was no positive evidence of stacking faults in the islands, but a few vacancies were observed.
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