title: Spectroscopy and crystal-field analysis of KY(3)F(10):Ho(3+).
abstract: A laser excitation and infrared absorption study of the single C(4v) symmetry centre in KY(3)F(10):Ho(3+) is presented. Comparatively weak upconversion fluorescence is observed and can be attributed to an energy-transfer excitation mechanism proposed previously. Fifty one crystal-field energy levels for seven Ho(3+) multiplets ((5)I(8), (5)I(7), (5)I(6), (5)F(5), (5)S(2), (5)F(4) and (5)F(3)) have been deduced. A crystal-field analysis has been performed, with excellent agreement found between experimental and calculated energy levels.
authors.affiliation: School of Physics, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa.
authors.forename: Marjorie
authors.initials: M
authors.lastname: Mujaji
authors.forename: Jon-Paul R
authors.initials: JP
authors.lastname: Wells