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The fine structure of the 2p‐exciton of KI single crystals due to envelope‐hole coupling is investigated by using high resolution two‐photon excitation spectroscopy. The energies of the split‐off 2P1/2, 2P3/2, and 2P5/2 states are (6.1990 ± 0.0014), (6.1898 ± 0.0003), and (6.1947 ± 0.0004)eV, respectively. The relevant spherical parameter μ and the upper limit for the cubic parameter δ are evaluated to be (0.051 ± 0.022) and 0.004, respectively. The fine structure in the LO‐phonon assisted band is also observed. The LO‐phonon energy at Γ point is obtained to be (16.4 ± 0.4) meV.
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Hasuo et al. (1991) studied this question.
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