Molecular beam studies of trapping dynamics

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Abstract
Molecular beam techniques have been used to probe the dynamics of trapping for a number of systems over a range of conditions. Specifically, we have determined the trapping probability in the limit of low coverage ζ0 as a function of kinetic energy E i and angle of incidence, θ i for the adsorption of Ar and Xe on Pt(111), of Ar on 2H–W(100) and of N2 on W(100) and ethane on Ir(110)‐(1×2). We find in all cases that ζ0 approaches unity as E i tends to zero, falling at higher energies at a rate that depends on the function E i cos n θ i . Values of n are found to range from 0 for the N2/W(100) system at 300 K, to 1.6 for Xe/Pt(111) at 85 K. We have also determined the effect of surface temperature T s for the case of Ar on Pt(111), and find that n tends to a value of 2 (corresponding to a dependence only on motion along the surface normal), as T s decreases to zero.

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