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Electromagnetic multipole moments and transitions

The SPME for the Eλ operator is given by ka||O(Eλ)||kb=(1)ja+1/2[1+(1)la+λ+lb]2 ×(2ja+1)(2λ+1)(2jb+1)4π(jaλjb1/201/2)ka|rλ|kbeqe.