The Resonant Secondary Emission of the <i>F</i> Center in KCl at 80 K

Abstract

The secondary emission RSE emitted after resonant excitation of F center in KCl has been measured over the whole Stokes range at 80 K. The degree of polarization P defined for the RSE intensities parallel and perpendicular to resonant light polarization is measured over the same range. The spectrum of P is divided into three successive regions; the depolarization range at the one-phonon Raman scattering, the near plateau range, and the depolarization range down to vanishing. The former two are found to depend on the resonant photon energy. The latter may be caused by the level crossing of 2 s - and 2 p -like electronic states during non-radiative process.