title: Direct calculation of 4f(3)-4f(3) transition intensities in Nd(3+)-doped YPO(4) system involving explicit effects of 4f(2)5d configuration.
abstract: The effects of the 4f(2)5d configuration on the intraconfigurational [Formula: see text] electric dipole transitions of Nd(3+) doped YPO(4) are taken into account by a 'direct' calculation. A simple model is applied to analyze the opposite-parity 4f(2)5d configuration admixing into 4f(3) transitional states. The matrix elements of the odd-rank crystal-field interaction and the interconfigurational electric dipole transition are directly expressed using a standard tensor operator method. A set of selection rules for f-d mixing and f-f electric dipole transitions is built up. The admixture effect is considered including both explicit 4f(2)5d configuration and other opposite-parity states such as the 4f(2)n(')g configuration which is treated by a closure procedure. Using this calculation method in combination with the experimental data from the absorption spectrum, a set of intensity parameters is obtained. The transition intensities originating from the high-lying (2)G(9/2)(2) level to the lower energy levels are then calculated, demonstrating a good agreement with the experimental results. The new calculation method is suitable for the electric dipole transitions within the 4f(N) configurations of trivalent lanthanide ions with more than two f-electrons.
authors.affiliation: Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, People's Republic of China. Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China.
authors.forename: Jinsu
authors.initials: J
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Wang
authors.forename: Jiahua
authors.initials: J
authors.lastname: Zhang