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Experimental results on a new O-2 center in CaF2 crystals

Von der Osten, W.
Published in Journal de Physique. Colloque. 1973, vol. C9-11, no. 1, p. 519-520
Abstract The model of a perturbed O-2 center in CaF2 is discussed on the basis of results from optical absorption, resonant Raman scattering, EPR and ENDOR measurements. Compared to the unperturbed center [4] the optical absorption of the presently discussed one is shifted to the visible and it exhibits a multiphonon structure. The O-2 stretching mode energy in the electronic excited state deduced from this structure is found to be 900 cm-1. A resonant Raman effect is observed up to 2nd order yielding the vibrational energy in the electronic ground state. The determined value amounts to 1 038 cm-1. The Raman selection rules are consistent with a molecular vibration along [l, 0, 0]. The ENDOR data are coherent when the center is assumed to be located near a fluorine cube edge probably substituting for two F- ions. At room temperature the center exhibits an orthorhombic g tensor in EPR. At higher temperatures, however, motional effects show up. The EPR spectrum becomes axial indicating vibrational motion of the center.
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Research group Groupe Bill
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BILL, Hans, VON DER OSTEN, W. Experimental results on a new O-2 center in CaF2 crystals. In: Journal de Physique. Colloque, 1973, vol. C9-11, n° 1, p. 519-520. doi: 10.1051/jphyscol:1973988 https://archive-ouverte.unige.ch/unige:3161

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Deposited on : 2009-09-21

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