Vibrational Excitations of Methane Monolayer Physisorbed on Ag(111) Surfaces
- 1 October 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (10A) , L1651
- https://doi.org/10.1143/jjap.26.l1651
Abstract
Vibrational spectra of a CH4 monolayer were studied by high-resolution electron energy loss spectroscopy. Monolayer of CH4 was physisorbed on a Ag(111) surface at 40 K. The dependence of vibrational excitation cross section on the incident electron energy and scattering geometry was studied. Excitation of the v 4 mode was mainly excited by dipole scattering, while the v 2 mode was excited via impact scattering. The combinational mode was observed at the incident electron energies of 6-10 eV. The effect of negative-ion resonance is discussed from the experimental results.Keywords
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