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