【摘要】 发散角为4.7×10^-3弧度,残余多谱勒宽度7兆赫的原子束与线宽6兆赫的可调谐染料激光正交,激光频率在30千兆赫范围扫描,测得⁶Li和⁷Li的2²P能级的精细结构分裂分别为9.7±0.4和10.5±0.5千兆赫,2²P_1/2能级的同位素位移为10.7±0.6千兆赫。激光频率作2.5千兆赫扫描,测得⁷Li的2²P_1/2←2²S_1/2跃迁的四条超精细结构谱线的间距依次为88±11、730±73和92±7兆赫,当光强为4毫瓦/厘米²时,记录的谱线宽度为22兆赫。对影响谱线宽度、相对强度及测量精度的一些因素也进行了讨论。更多还原

【Abstract】 When a CW tunable dye laser beam with a linewidth of 6 MHz and a divergence of 4.7 x 10-3 radian irradiated across a Li atomic beam at right angle and scanned at the 30 Q Hz range, we recorded the fine and hyperfine structure of the transitions. Fine splittings in 22P terms of 6Li and 7Li have been measured to be 9.7+0.4 GHz and 10.5+0.5 GHz, respectively, and the isotope shift of 22P1/2 term being 10.7 + 0.6 GHz. With a scanning range of 2.5 GHz, spacinga of the successive lines of 7Li 22P1/2-22Si/2 transitions have been measured to be 88+llMHz, 730 + 73MHz and 92+7MHz, respectively. With a laser intensity of 4mW/cm2 and the oven temperature of 460C, the recorded linewidth was about 22 MHz. A number of factors affecting the linewidth, the relative strength of lines and the accuracy of measurement are discussed.更多还原