Excited-state electronic Raman scattering of alexandrite

✍ Scribed by Wang Hui; Lou Li-Ren; Shi Chao-Shu

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 217 KB
• Volume: 21
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/jrs.1250210712

✦ Synopsis

Abstract

Raman scattering is used to investigate the electronic excited‐states of alexandrite at low temperature (13 K). The Raman spectra of Cr^3+^ ions in two non‐equivalent types of crystal field sites, one having mirror symmetry C~s~ the other having inversion symmetry C~1~, are reported. With λ~e~ = 514.5 nm excitation, the Raman transitions of the metastable state ^2^A′ (R~m1~) → ^2^A″(R~m2~) and ^2^A′(R~m1~) → ^2^A″(^2^T~1~) of Cr^3+^ in the C~s~ site are 36 cm^−1^ and 600 cm^−1^, respectively; with λ~e~ = 488.0 nm excitation, the Raman transition between ^2^A~g~(R~11~) and ^2^A~g~(R~12~) of Cr^3+^ in the C~1~ site is 116 cm^−1^.