The two-photon absorption spectrum of KI has been measured to 7.5 eV. The region studied spans the spectral range in which all the prominent one-photon absorption peaks reside. Our two-photon data exhibit two noticeable peaks at 7.21 and 7.375 eV. Based on the parity argument and polarization dependence, we tentatively assign the peak at 7.21 eV to a Δ₆→Δ₆ transition.
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Park et al. (1969) studied this question.
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