Abstract
A newly observed branch of surface phonon modes characteristic of the GaAs(110) surface is interpreted in terms of bond-length-conserving rotations of the top layer atoms. This model yields calculated photon frequencies which agree well with the experimental values. The rotational surface phonon modes are predicted to exhibit small dispersion both along and perpendicular to the (110) zigzag chain. The frequencies of these phonons also are predicted for the (110) surfaces of GaP, GaSb, InP, InAs, InSb, ZnS, ZnSe and CdTe.
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