中文摘要：

提出并演示了一种光泵预选态的原子光谱测量方法,并对Ba原子的6s5d3 D态与6p5d3 F态的超精细结构及该跃迁的同位素移动进行了直接测量。首先利用791nm的激光激发Ba原子特定同位素及特定超精细结构的6s6s 1 S0→6s6p3 P1跃迁,并利用6s6p3 P1→6s5d3 D2的自发辐射有选择地分别将这些同位素制备到6s5d3 D2态不同的超精细能级上,再用778nm的激光扫出对应的6s5d3 D2→6p5d3 F2跃迁的荧光光谱,通过这几组光谱之间的对比直接实现了对22条超精细谱线的认定和归属,从而得到了135 Ba和137 Ba的6s5d3 D2能级与6p5d3 F2能级的超精细结构常数及该跃迁的同位素移动。

英文摘要：

In the present experiments,a new method of atomic spectral measurement using s tate s 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.