For the first time there is experimental evidence for a distinct fine structure in the exciton spectrum of cubic semiconductors caused by envelope-hole coupling. As an example, we present measurements of the $2P$ exciton in cubic ZnSe by two-photon absorption. The highly resolved threefold energy splitting into P1/2, P3/2, and P5/2 states is explained within a spherical model. We determine the spherical effective-mass parameter μ and give an upper limit for the cubic parameter δ.
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Sondergeld et al. (1975) studied this question.
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