Abstract
A closed-form expression is derived for the dynamic multipole polarisability of hydrogen in an arbitrary S state. This expression is analytic around omega =0 and can thus be used to generate the negative-order multipole sum rules in hydrogenic atoms. The residues and discontinuities across the branch cut in this expression lead to closed-form expressions for the multipole transition matrix elements in hydrogenic atoms.

This publication has 11 references indexed in Scilit: