Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
91 (1989), S. 4974-4984
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Sticking of light gas atoms (He,D,H) on the (0001) surface of graphite is studied theoretically in the framework of the quantum mechanical perturbation theory. The formulas include a detailed microscopic description of the solid structure and vibrations. The calculations are employed in conjunction with the published experimental data to investigate the properties of the inelastic gas–surface coupling in the He/graphite system. The inelastic coupling is suggested to have a significant attractive component, and to be confined to highly localized spots on the surface. The low energy sticking probability is shown to be very sensitive to the weak coupling between the graphite layers. The high energy sticking via excitation of the optical out-of-plane phonons is found to be very inefficient. The isotopic effect is investigated in the H,D/graphite system. While the heavy isotope sticks about two times more efficiently in the low energy limit, the decay of the sticking probability with the energy is slower for the lighter isotope. Therefore the difference in the sticking probability of the two isotopes decreases strongly towards higher energies.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.456738
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