Collective Excitations in Ethane Monolayers Adsorbed on Graphite (0001) Surfaces
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Inelastic incoherent neutron spectra below 4.1 THz have been obtained for the √3×4 "herringbone" and √3×√3 "on-end" monolayer phases of ethane adsorbed on graphite basal planes. One-phonon cross sections calculated independently with empirical atom-atom potentials make possible identification of the collective vibrational modes observed and reproduce qualitatively the rather different spectra of the two phases.
Phys. Rev. Lett. 53, 572-575 (1984)