Two-photon absorption spectra in the excitonic region of KCl up to 8.65 eV are reported. The sources employed in the two-photon experiment are the synchrotron radiation together with a neodymium-doped yttrium aluminum garnet laser. The measured absorption spectra show structures attributed to the 2p and 3p exciton levels associated with the direct gap of KCl. These optical data give a direct measurement of the energy gap and an estimation of the exciton mass of KCl.
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Casalboni et al. (1991) studied this question.
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