Symmetry assignments of one-phonon sidebands in the emission spectrum of the F+centre in calcium oxide

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Abstract
Stress-induced dichroism in the emission spectrum of the CaO F+ centre has been used to identify the symmetry of the vibrational modes coupling to the 2T1u excited electronic state of the defect. The polarization of the main one-phonon sidebands under (001) and (110) stress shows that a peak at a separation of h(cross) omega =205 cm-1 from the zero phonon line is due predominantly to A1g modes and a sharp peak at h(cross) omega =302 cm-1 to a composite of Eg and T2g modes. A separation of the Eg and T2g components shows that the frequencies of these modes are equal to within about 15 cm-1, and that they couple equally strongly to the electronic state. The relevance of this result to the lattice dynamics and Jahn-Teller effect of the F+ centre is discussed.

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