Abstract
The kinetics of molecular hydrogen physisorption on a cold ( ∼10 K) Cu(100) surface have been investigated using molecular beams with incident energies in the range 30–70 meV. The adsorption probability, S, is found to increase linearly with the fractional coverage, θ. The data are consistent with a kinetic model that comprises sticking via impact on the bare surface and via collision with a pre-adsorbed molecule, with probabilities S 0 and S 1 respectively. S 1 is found to be larger than S 0 by an order of magnitude which implies that collisions between incident and adsorbed molecules provide a very efficient means for absorbing the incident kinetic energy on initial impact.
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