All Physics Faculty Publications

Document Type

Article

Journal/Book Title/Conference

Physical Review Letters

Volume

64

Issue

7

Publisher

American Physical Society

Publication Date

2-1990

First Page

764

Last Page

767

DOI

10.1103/PhysRevLett.64.764

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.

Comments

http://link.aps.org/doi/10.1103/PhysRevLett.64.764

Published by the American Physical Society in Physical Review Letters. Publisher PDF is available for download through the link above.

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