title: [Direct determination of hyperfine structures and isotope shifts in the 6s5d 3D --> 6p5d 3F transitions of Ba I].
abstract: In the present experiments, a new method of atomic spectral measurement using states optical pre-selection was proposed and demonstrated, and the measurement of hyperfine-structures and isotope shifts in the 6s5d 3D --> 6p5d 3F transitions of Ba I was taken as an example. A 791 nm laser was used to excite the different hyperfine transitions 6s6s 1S0 --> 6s6p 3P1 for different isotopes of barium and different hyperfine energy-levels of 6s5d 3D2 for these isotopes were populated by the 6s6p 3P1 --> 6s5d 3D2 spontaneous radiations, then the corresponding fluorescence spectra of 6s5d 3D2 --> 6p5d 3F2 transitions excited by another 778 nm laser were recorded. Comparing of these spectra, 22 lines were recognized and the hyperfine-structure constants of 6s5d 3D2 and 6p5d 3F2 of 135Ba and 137Ba were evaluated consequently while the isotope shifts of these transitions were also determined.
authors.affiliation: State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China. jqzhong@wipm.ac.cn
authors.forename: Jia-qi
authors.initials: JQ
authors.lastname: Zhong
authors.forename: Geng-hua
authors.initials: GH
authors.lastname: Yu
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.forename: Ming-sheng
authors.initials: MS
authors.lastname: Zhan