Abstract
An experimental and group-theoretical study of single phonon vibronic sidebands of theR-lines in ruby has been performed. Restrictions in the electron-phonon-spectra due to crystal symmetry occur only inE‖C-polarization and for phonons withk-vectors zero or parallel to theC-axis. An analysis of the fluorescence and excitation spectra led to an identification of part of the lines in the vibronic sidebands with normal modes of the lattice. In the regime of acoustical phonons the intensity of the sideband increases with frequency following a potential law with an exponent of slightly less than 5. A strong enhancement of the vibronic transition probability was found on the high frequency side of theR-lines due to a resonance with the electronic transitions4A2-2T1. Crosssections of the vibronic transitions in the spectral range of Stokes- and anti-Stokessidebands are given in a diagram. For acoustical phonons with energies up to 6 THz they are also expressed in a formula.
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