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Raman and Vibronic Spectra of a New Oxygen Molecule Ion in CaF2

Von der Osten, W.
Published in Physica Status Solidi. B. 1976, vol. 75, no. 2, p. 613-619
Abstract Spectra are reported of an unidentified oxygen molecule center of monoclinic symmetry found in natural crystals of CaF2. Two alternative models consisting of a perturbed O and a O molecule ion substituting for two fluorine neighbors are discussed. In contrast to the well-known unperturbed O center in CaF2, this new center has a visible absorption band. This band exhibits vibronic structure corresponding to an excited-state vibrational frequency of (900 ± 10) cm-1 and coupling constants S 6 for this vibration and S 6 for the lattice phonons. This structure is enhanced in stress-induced dichroism spectra. Resonance Raman scattering excited in this band shows the ground-state vibrational fundamental at (1038 ± 1) cm-1 and the overtone at (2076 ± 2) cm-1. The polarization of these features is consistent with the 100 orientation of the center. The Lorentzian line-shape, the width, and the relative intensity of the two- and one-phonon scattering peaks are consistent with recent theories of the resonant Raman effect of impurity centers.
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Research group Groupe Bill
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BILL, Hans, VON DER OSTEN, W. Raman and Vibronic Spectra of a New Oxygen Molecule Ion in CaF2. In: Physica Status Solidi. B, 1976, vol. 75, n° 2, p. 613-619. https://archive-ouverte.unige.ch/unige:3149

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Deposited on : 2009-09-21

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