Energy Levels of Prplus;3in Pr(NO3)3middot;6H2O

摘要

The energy levels of Prplus;3in Pr(NO3)3middot;6H2O have been determined from optical absorption experiments on single crystals at 77deg;K. With the exception of three bands, all of the electronic intrahyphen;f1transitions from the ground state multiplet to higher multiplets were observed. The absorption spectrum along with the determined Stark level schemes of the multiplets and their centers of gravity are reported. An expanded ldquo;freehyphen;ionrdquo; Hamiltonian which includes configuration interactions along with spinndash;otherhyphen;orbit and spinndash;spin interactions was used in the analysis of the multiplet centers of gravity. In a leasthyphen;squares fit calculation the besthyphen;fit freehyphen;ion parameters found wereF2thinsp;equals;thinsp;315.44cmminus;1,F4thinsp;equals;thinsp;51.17cmminus;1,F6thinsp;equals;thinsp;5.19cmminus;1,zgr;4fthinsp;equals;thinsp;741.12cmminus;1,agr;thinsp;equals;thinsp;18.76cmminus;1,bgr;thinsp;equals;thinsp;minus;756.77cmminus;1,ggr;thinsp;equals;thinsp;88.05cmminus;1,M0thinsp;equals;thinsp;0.43cmminus;1. The average deviation between the calculated best fit and the experimental ldquo;freehyphen;ionrdquo; energy levels is 27 cmminus;1. A firsthyphen;order perturbation calculation was carried out for the Stark levels of the various observed multiplets of the Prplus;3lpar;4f2rpar;ion in a crystal field of C1symmetry. Because of the large number of crystal field parameters involved in the potential, only a tentative set of besthyphen;fitBkqparameters were determined from a leasthyphen;squares calculation.