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On the nature of the lowest excited state of Cr4+-doped olivines

✍ Scribed by M. Atanasov

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 419 KB
Volume: 234
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)00063-a

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✦ Synopsis

A Franck-Condon and ligand field analysis of published spectral data are used to characterize the lowest excited state of Cr 4+ at the distorted tetrahedral sites in Ca2GeO a as dominated by a split component of the 3T: term, with a negligibly small 1E admixture, in contrast to Mg2SiO 4 (forsterite), where a roughly 1:1 3T 2 and IE mixing is found. The small changes in the Cr-O equilibrium geometry on excitation, as reflected by the most prominent 0-0 line in both matrices result from the large stretching mode force constant which outweighs the vibronic force upon exciting from e: (ground state) to e lt~ (excited state). The broad-band low-temperature emission in some Cr4+-doped olivines is assigned to bending modes which become active for sufficiently large geometric distortions.

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