title: Synchrotron excitation, emission and theoretical simulation of lanthanide ions in hexachloroelpasolite crystals.
abstract: Emission and excitation spectra of Cs(2)NaLnCl(6) (Ln = Y, Eu, Gd, Er, Yb), Cs(2)NaYCl(6):Ce and Cs(2)NaYCl(6):Tm have been recorded using synchrotron radiation. With the possible exception of the case for Ce(3+), no [Formula: see text] transitions are observed and the emission spectra are entirely assigned to [Formula: see text] intraconfigurational transitions of Ln(3+) in LnCl(6)(3-) and impurity species. The excitation spectra comprise intraconfigurational, charge transfer and band-to-band transitions. Trace impurities of oxy-species or of other lanthanide ions have a profound effect upon the spectra. The 4f-5d absorption spectra have been simulated by employing the suite of programs of Professor M F Reid and the results have been included together with the experimental spectra.
authors.affiliation: Institute of Modern Physics, Chongqing University of Post and Telecommunications, Chongqing 400065, People's Republic of China. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, People's Republic of China.
authors.forename: Chang-Kui
authors.initials: CK
authors.lastname: Duan
authors.forename: Peter A
authors.initials: PA
authors.lastname: Tanner
authors.forename: Andries
authors.initials: A
authors.lastname: Meijerink
authors.forename: Vladimir
authors.initials: V
authors.lastname: Babin