Corrugation in the nitrogen-graphite potential probed by inelastic neutron scattering

Flemming Yssing Hansen, V. L. P. Frank, H. Taub, L. W. Bruch, H. J. Lauter, J. R. Dennison

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Abstract

Inelastic neutron spectra of the commensurate √3 ×3 herringbone monolayer phase of nitrogen physisorbed on the graphite (002) surface at low temperature have been compared with lattice dynamics calculations of the polycrystalline-averaged one-phonon coherent neutron cross section. The observed zone-center energy gap of ∼0.4 THz in the acoustic-phonon branches is a factor of 2 larger than calculated from central atom-atom potentials. We conclude that current models of the corrugation in the adatom substrate potential greatly underestimate the lateral restoring forces in this relatively simple molecular film.
Original languageEnglish
JournalPhysical Review Letters
Volume64
Issue number7
Pages (from-to)764-767
ISSN0031-9007
DOIs
Publication statusPublished - 1990

Bibliographical note

Copyright (1990) by the American Physical Society.

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