The dynamics of desorption induced by atomic hydrogen: HD/Cu(111) |
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Authors: | P Kratzer W Brenig |
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Institution: | 1. Physik Department T30 der Technischen Universit?t München, D-85747, Garching, Germany
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Abstract: | Recent observations of a direct reaction between adsorbates and hydrogen atoms incident from the gas phase are interpreted
in terms of an Eley-Rideal reaction. A detailed comparison of the experimental data for the HD/Cu(111) system with quantum
mechanical model calculations corroborates such an interpretation. The peculiar isotope effect observed can be understood
from the different dynamical implications of appropriately rescaled potential energy surfaces. The width of the measured time-of-flight
spectrum is explained from the overlapping contributions of the populated vibrational levels. The angular distributions are
rationalized by contributions both from ‘indirect’ events, where the incident atoms make several bounces in the surface well
prior to reaction, and ‘direct’ reactive events. |
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Keywords: | 82 65 -i 68 35 Ja 34 50 Lf |
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