Abstract
The \(\varGamma_{1}\)-symmetry of the lowest excitonic molecule state of CuCl has been confirmed experimentally from the measurements of the giant two-photon absorption and resonance Raman scattering by using circularly polarized dye laser light. The giant two-photon transition is found to be forbidden for single beam of circularly polarized light while it is allowed for two beams of circularly polarized lights impinging in crystals from directly opposite directions. It has been verified that the lowest excitonic molecule state is composed of two-electron- and two-hole-states both of the composite spin angular momentum zero.
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