激光光压偏转原子束分离锂同位素

用激光光压偏转原子束进行了锂同位素分离实验。准直比为450:1的原子束装置,炉温600℃时发生的原子束的数密度为10~9个原子/厘米~3,可调谐连续染料激光经柱面镜系统扩束后与原子束正交。激光线宽6兆赫,在1厘米长的交叉区域内功率密度为70毫瓦/厘米~2。当激光频率对准~7Li2~2P_(3/2)F=3←2~2S_(1/2)F=2跃迁时,~7Li原子从束中偏转。被偏转的原子中几乎不合~6Li,为非常纯的~7Li。当激光频率对准~6Li和~7Li2~2P←2~2S跃迁的其它超精细跃迁时,未看到明显的偏转,这是由于基态超精细能级的光泵浦效应所致。

Separation of Li isotopes by laser deflection of atomic beams

Separation of Li isotopes by laser deflection of atomic beams has been carried out. An atomic beam apparatus with a collimating ratio of 450/1 generates a Li atomic beam of 109 atoms/cm3 at the oven temperature of 600C. The CW tunable dye laser crossing the atomic beam at a right angle has a linewidth of 6 MHz and its intensity at the 1 cm interaction area is about 70 mW/cm2. When the laser frequency is tuned to coincide with 7Li 22P3/2F=3-22S1/2 F = 2 transition, TLi atoms are deflected from the beam. The deflected atoms are very pure 7Li and almost does not contain 6Li. When the laser frequency coincides with any other transition of 22P -22/S of both 6Li and 7Li, no apparent deflection is observed because of the optical pumping of the hyperfine levels of the 22/S1/2 ground state.