Abstract
The adsorption and desorption of gold on heat-cleaned surfaces of polycrystalline molybdenum was studied at a residual gas pressure of 2×10 −9 torr. A radio-tracer method was used in a differential pumping system. The sticking coefficient was measured to be s = 0·99 ± 0·01 at beam densities up to 10 11 particles/cm 2 sec. The desorption probability per unit time was found to obey a relation w = w 0 exp(− E/ kT) with w 0 = 2 · 10 13 sec −1 and E = 4·2 ± 0·2 eV.
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