基态原子与理想金属Au表面间的范德瓦尔斯作用

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,构建了计算超精细能级碱金属原子与理想金属表面间vdW作用系数C3的理论模型.以85Rb、133Cs为例,计算了其基态原子超精细能级的C3系数.其中85Rb: 52S1/2 (F=2)及52S1/2 (F=3)对应的C3系数分别为:2.2409 及2.2425 ;133Cs: 62S1/2 (F=3)及62S1/2 (F=4)分别对应 2.4480 及2.4538 .研究还发现随着 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具有重要意义

Van der Waals Interaction between Ground State Atoms and Perfect Surface of a Metal and Calculation of C3 in Hyperfine Atomic Levels

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 calculate C3 values of the vdW interaction between hyperfine levels alkali atoms and perfect surface of a metal. C3 values corresponding to hyperfine levels of 85Rb and 133Cs are calculated, where C3 values of 52S1/2 (F=2) and 52S1/2 (F=3) for 85Rb are 2.2409 and 2.2425 , respectively, while 62S1/2 (F=3) and 62S1/2 (F=4) for 133Cs 2.4480 and 2.4538 . 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. The calculation can be used in the application of atomic trapping and quantum reflection from the dielectric surfaces.