基态原子与理想金属Au表面间的范德瓦尔斯作用及超精细能级C3的估算

摘要

Van der Waals (vdW)interaction between alkali atoms and perfect surface of a metal Au is investigated. Taking into account the contribution to vdW from the electric quadruple,a theoretical model is presented to calcu-late C3 values of the vdW interaction between hyperfine levels of alkali atoms and perfect surface of a metal.C3 val-ues corresponding to hyperfine levels of 85 Rb and 133 Cs are calculated,where C3 values of 52 S1/2 (F=2)and 52 S1/2 (F=3)for 85 Rb are 2.2409KHzμm3 and 2.2425 KHzμm3 ,respectively,while 62 S1/2 (F=3)and 62 S1/2 (F=4)for 133 Cs 2.4480 KHzμm3 and 2.4538KHzμm3 .It is also shown that,the greater the F,the larger the C3 ,and the stronger the vdW interaction when z does not change,where z is the distance of an atom from the metal surface. This research on atomic imprisoned and quantum reflection from the dielectric surface has certain significance.%研究了基态碱金属原子与理想金属Au表面间的范德瓦尔斯(vdW)作用.通过分析电四极跃迁对vdW的贡献,构建了计算碱金属原子的超精细能级与理想金属表面间vdW作用系数C3的理论模型.以85 Rb、133 Cs为例,计算了其基态原子超精细能级的C3系数.其中85 Rb：52 S1/2(F=2)及52 S1/2(F=3)对应的C3系数分别为：2.2409KHzμm3及2.2425KHzμm3；133 Cs：62 S1/2(F=3)及62 S1/2(F=4)分别对应2.4480 KHzμm3及2.4538 KHzμm3.研究还发现随着F的增大,C3增大,z (原子与金属表面之间的距离)不变时,原子与理想金属表面间vdW作用增强.这一研究在实现原子囚禁及介质表面量子反射等方面有一定的意义.