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arXiv:cond-mat/9310057 · Journal of Alloys and Compounds

The relationship between perturbation theory and direct calculations of rare earth transition intensities

Michael F. Reid, Gary W Burdick, H.J Kooy

Published Jun 1, 1994• 11 citations
arXivHTMLPDF
DOI
10.1016/0925-8388(94)90181-3

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The absorption of a single photon by the simultaneous excitation of two rare-earth ions was first reported by Varsanyi and Dieke in 1961.1 D. L. Dexter explained this unusual observation by including the electron-electron interactions (that also give rise to energy transfer) between the rare earth ions with perturbation theory.2 In the 70's Dexter became interested in electronic-vibrational coupling. A theory of two-center optical transitions was developed for a rare-earth ion weakly coupled to a high energy, internal vibrational mode of a near-lying ion.3 Using theoretical techniques that had been developed for rare-earth ion pairs, intensities and selection rules could be determined.