title: Spectroscopy of shear horizontal surface phonons by rotation-flip scattering of ortho-H2 molecules.
abstract: Ortho-H2 molecules in the j=1 state are predicted, on the basis of a simple extension of the distorted wave approximation, to excite shear-horizontal (SH) polarized surface phonon modes, which are symmetry forbidden in inelastic He atom planar scattering. The symmetry breaking is provided by Deltam-rotational flip transitions which couple efficiently to the shear-horizontal modes. A confirmation is provided by the observation of SH surface phonons in phonon inelastic scattering of H2 from NaCl(001).
authors.affiliation: Max-Planck-Institut für Dynamik und Selbstorganisation, Postfach 2853, D-37018 Göttingen, Germany.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Benedek
authors.forename: Franziska
authors.initials: F
authors.lastname: Traeger
authors.forename: J Peter
authors.initials: JP
authors.lastname: Toennies