Abstract
The three-photon absorption (3PA) spectra of KI and RbI have been measured at 80 K in a wide excitation-energy range by monitoring the resulting self-trapped exciton luminescence. The experimental results have shown that the spectral behavior of the 3PA coefficient is fully described by a parametric formula containing four different terms, their energy dependences being predicted on the grounds of 3PA selection rules. A qualitative and quantitative comparison between the experimental and the various theoretical 3PA line shapes has been carried out.
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