Ba原子6s5d^3 D与6p5d^3 F态的超精细结构及态间跃迁的同位素移动的直接确定  

Direct Determination of Hyperfine Structures and Isotope Shifts in the 6s5d^3 D→6p5d^3 F Transitions of Ba Ⅰ

作　　者：仲嘉琪[1,2,3] 余庚华[1,2,3] 王谨[1,2] 詹明生[1,2] 

机构地区：[1]中国科学院武汉物理与数学研究所波谱与原子分子国家重点实验室,湖北武汉430071 [2]中国科学院冷原子物理中心,湖北武汉430071 [3]中国科学院研究生院,北京100049

出　　处：《光谱学与光谱分析》2012年第1期11-14,共4页Spectroscopy and Spectral Analysis

基　　金：国家重点基础研究发展计划(2005CB724501);国家自然科学基金项目(10827404)资助

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。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.

关 键 词：原子光谱学 原子超精细结构 同位素位移 荧光 

分 类 号：O562[理学—原子与分子物理]