Optical Detection of Paramagnetic Resonance in the Excited State ofFCenters in CaO

Abstract

A detailed analysis of this double-resonance experiment shows that the emission takes place from the ${}_{}{}^3{}_{}{}^{}P$ excited level whose degeneracy is lifted by the Jahn-Teller coupling to $E_{\mathrm{g}}$ modes of vibration. An energy-level crossing effect is observed and its origin discussed.