About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Paper
Molecular beam studies of trapping dynamics
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 ξ0as a function of kinetic energy Eiand angle of incidence, θifor the adsorption of Ar and Xe on Pt( 111), of Ar on 2H-W(100) and of N2on W(100) and ethane on Ir(110)-(lx2).We find in all cases that ξ0approaches unity as Eitends to zero, falling at higher energies at a rate that depends on the function Eicosnθi. 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 Txfor 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 Tsdecreases to zero. © 1990, American Vacuum Society. All rights reserved.