Use of the factorized form for the collision strength in exploration of the effect of the generalized Breit interaction

Expressions are given for the convenient factorized form [Bar-Shalom, Klapisch, and Oreg, Phys. Rev. A 38, 1773 (1988)] for the collision strength with inclusion of the generalized Breit interaction. This is used to explore further the importance of the inclusion of the generalized Breit interaction in calculating electron-impact excitation cross sections or collision strengths, by considering the inner-shell excitation of Be-like uranium and the n=2 to n=3 transitions in neonlike xenon and uranium.