Abstract
AbstractThe first excited state of the excitonic molecule in CuCl is considered in the framework of the previously derived Bose formulation for the excitonic molecule. A resolution concerning the discrepancies between existing theoretical and experimental two‐photon absorption results is proposed: the first excited (rotational) state of the molecule consists of four irreducible sets: Γ2 ⊕ Γ3 ⊕ Γ4 ⊕ Γ5, two of which (Γ3 ⊕ Γ5) are strongly two‐photon allowed, one is weakly allowed (Γ4) and one is forbidden (Γ2). The three sets Γ3 ⊕ Γ4 ⊕ Γ5 should then be seen in luminescence from the biexciton states to single‐exciton or exciton‐polariton states. A study of the electron‐hole exchange interaction on these states is also made.
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