Resonant Secondary Emission Spectroscopy

A prospective view is taken of a new field of optical spectroscopy, unifying resonance Raman scattering and luminescence, with main emphasis on conceptual and theoretical aspects. The method consists in explicitly exploiting two independent sets of probes, ( e , ω, k ) and (e′, ω′, k′), i. e. polarization, frequency, and wave vector of incident and scattered photons, respectively. As compared with absorption spectroscopy, where one has only one set of probes ( e , ω, k ), the secondary emission spectroscopy gives higher information about the dynamics of the material: interaction in the intermediate states or relaxation , characterized experimentally and theoretically by the secondary emission intensity I s ( e , ω, k; e′, ω′, k′), which is a measure of polarization‐, energy‐, and momentum‐ correlation of incident and scattered photons.