Radiative and Two-Photon Resonance Raman Processes Associated with Excitonic Molecules in CuCl

概要

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Giant two-photon absorption spectrum for the direct generation of excitionic molecules is measured with using a frequency tunable dye laser, and absorption peak is found at 3.1870 eV. Emission spectrum with exctation at the giant two-photon absorption band depends on the spectral width, ？Ω_1, of excitarion light. In the case of ？Ω_1=0.25 meV, the two^photon resonance Raman scattering is found to be predominant. The Raman process involes an excitonic molecule and a longitudinal exciton as the intermediate and final states, respectively. On the oter hand, for the case of ？Ω_1=2.3 meV, the emission spectrum shows a very sharp line at 3.1649 eV, which has been previously ascribed to be due to the Bose-Einstein condensation of excitonic molecules. Discussions are made on the dependence of emission spectrun upon the energy band-width of excitation light.
社団法人日本物理学会の論文
1976-09-15