The twohyphen;photon (TP) spectra of the Cu+and Ag+impurities in some alkali chloride hosts have been obtained; here the ion is situated in a nearly octahedral chloride environment. Since thedrarr;stransitions observed in the near UV are electronically allowed in TP spectroscopy (dgr;=3 gm), a simple theory of the polarization studies, in conjunction with the DVhyphen;Xagr; computer code led to a definitive characterization of the1Eg,1T2gcrystal field splitting of thed9sexcited state. We also obtained evidence of the Jahnndash;Teller effect in the1Eg(d9s) state as well as a good understanding of the mixing of the1Eg,1T2gstates resulting from the dynamic and static displacements of Cu+. The absolute value of the twohyphen;photon cross section was measured and compared to a calculated value.
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