title: Chemical surface analysis by Raman spectroscopy utilizing dimer vibrations.
abstract: We report on the investigation of reconstructed semiconductor surfaces by Raman spectroscopy from dimer vibrations. Localized modes of Te dimers on the (100) surface of the zinc blende II-VI semiconductor BeTe allow the analysis of Te- and Be-rich surface structures, as well as oxidation effects. The Te-rich surface exhibits one dimer-vibration mode at 165 cm(-1), while two modes appear at the Be-rich surface (157 and 188 cm(-1)). The mode assignment as dimer vibrations is underscored by their symmetry properties and by frozen phonon calculations, yielding mode frequencies and eigenvectors. This approach opens up a new field of surface chemistry analysis by dimer-vibration spectroscopy.
authors.affiliation: Physikalisches Institut, Universität Würzburg, Am Hubland, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Wagner
authors.forename: J
authors.initials: J
authors.lastname: Wagner
authors.forename: S
authors.initials: S
authors.lastname: Gundel
authors.forename: L
authors.initials: L
authors.lastname: Hansen
authors.forename: J
authors.initials: J
authors.lastname: Geurts