Perturbation Theory and Dalgarno-Lewis (DL) Method in Presence of Multiple Laser Beams

The evaluation of second and higher order perturbation of energy by iterative solution of Schrodinger’s equation, rather than evaluation of matrix element is described. DOI: http://dx.doi.org/10.3126/njst.v14i2.10432 ？ Nepal Journal of Science and Technology Vol. 14, No. 2 (2013) 165-170