Abstract
Inelastic incoherent neutron spectra below 4.1 THz have been obtained for the $\sqrt{3}\ifmmode\times\else\texttimes\fi{}4$ herringbone and $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ 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.
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