摘要
By virtue of the technique of integration within an ordered product of operators we derive the concise normally ordered expansion of the even-power of the radial coordinate operator via the equation r = f d^(3)x |x〉〈x| r, where |x〉 is the three-dimensional coordinate eigenvector, and r = (x^(2 )+ y^(2) + z^(2))^(1/2). The application to perturbation theory is briefly discussed.
作者
FAN Hong-Yi
范洪义(Department of Applied Physics,Shanghai Jiao Tong University,Shanghai 200030;Department of Material Science and Engineering,University of Science and Technology of China,Hefei 230026)
基金
Supported by the Educational Ministry of China and the National Natural Science Foundation of China under Grant No.19875046.
