title: 4f-5d Transitions of Tb3+ in Cs2NaYF6: the effect of distortion of the excited-state configuration.
abstract: The low-temperature absorption and excitation spectra of interconfigurational 4f-5d transitions of Tb(3+) in a cubic fluoride host demonstrate the appearance of a first-order linear Jahn-Teller effect for the high-spin excited states of the excited electronic configuration 4f(7)5d involving 5d t(2g) orbitals. The τ(2g) mode is observed to be responsible for the splitting of the otherwise degenerate 5d t(2g) orbitals.
authors.affiliation: 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: Makhov
mesh_terms: D002942:Circular Dichroism; D003080:Cold Temperature; D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D028581:Lanthanoid Series Elements