Phonon density of states deduced from the fine structure of an electronic transition at an impurity ion

The optical spectra of transition metal ions substituted in non-magnetic host lattices show a complicated fine structure caused by the coupling with non-localized vibrational modes of the host lattice. The theory of this effect is presented. It is shown that the observed vibronic structure images th...

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Bibliographic Details
Published in:Physica B + C 1981-01, Vol.105 (1), p.347-352
Main Authors: Kuindersma, S.R., Boudewijn, P.R., Haas, C.
Format: Article
Language:English
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Summary:The optical spectra of transition metal ions substituted in non-magnetic host lattices show a complicated fine structure caused by the coupling with non-localized vibrational modes of the host lattice. The theory of this effect is presented. It is shown that the observed vibronic structure images the phonon density of states in the Brillouin zone, modified by matrix elements and selection rules of the electronic transition. The spectra of Ni 2+( 3A 2g→ 1E g) and Co 2+( 4T 1g→ 2T 1g) substituted in CdI 2 are used to deduce the maxima of the phonon density of states of CdI 2 and to estimate the phonon dispersion curves. The spectra show the influence of the strong anisotropy of the lattice vibrations of these layered materials.
ISSN:0378-4363
DOI:10.1016/0378-4363(81)90273-4