Abstract
The kinetics of H 2 and D 2 low-temperature (down to 5 K) adsorption on the Mo(110) surface have been studied by a molecular beam method. An effusion molecular beam is directed onto the surface of the cooled sample and the intensity of the flux of scattered (or desorbed) molecules is measured with a QMS detector. This intensity has been used to determine the sticking probability. Two main isotope effects have been revealed in adsorption kinetics, as follows. (1) The sticking probability S of D 2 on the Mo(110) surface is higher than that of H 2, which may be a sign of the phonon mechanism of energy loss of impinging molecules. (2) The coverage dependence of the sticking probability S( θ) for the H 2/Mo(110) system displays a sharp and deep minimum near θ=0.5, whereas no such a dramatic feature is found in the case of the D 2/Mo(110) system. The differences between the quantum properties of H 2 and D 2 molecules seem to play a significant role in these effects. Essential dissimilarities are found between hydrogen adsorption kinetics on the Mo(110) and W(110) surfaces.
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