Doubly resonant Raman electron paramagnetic transitions of Cr<SUP>3+</SUP> in ruby (Al2O3:Cr<SUP>3+</SUP>)

초록

We report the Raman electron paramagnetic resonance (EPR) of Cr3+ in ruby (Al2O3:Cr3+) in the (4)A(2) (ground) and (E) over bar (excited) states of its well-known R-1 emission line. Using tunable dye laser excitation within the range of the Zeeman components of R-1, we observe highly selective doubly resonant enhancements of the Raman EPR lines. The double resonances confirm the assignments of the Raman EPR lines, and they underscore the simultaneous occurrence of both "in resonance" and "out resonance" as visualized in the Kramers-Heisenberg quantum-mechanical picture of inelastic light scattering. The g factors of the (4)A(2) and (E) over bar states are consistent with the observed magnetic field dependence of the Raman EPR shifts. Through the interplay of Raman effect and the sharp Zeeman components of R-1, the results provide clear insights into the underlying microscopic mechanism of these resonant Raman EPR spectra of ruby.

키워드