Two-Quantum Absorption Spectrum of KI and CsI

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Abstract
The measurement of the two-quantum fundamental absorption edge in KI and CsI at 300, 77, and 4°K is described. Selection rules, exciton models, phonon coupling, and the theory of two-quantum absorption are briefly discussed. Comparison of the present results with theory and the one-quantum absorption leads to the quantitative understanding of the shape and magnitude of the two-quantum spectrum. It is shown that one-electron band structure and Wannier excitons, rather than excitation models, provide the best understanding of the low-energy part of the fundamental absorption edges in the materials studied.

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