60 citations · 228 across the 13 of their papers we have counts for
5 papers · 1 filter
Simplified partial wave expansion of the Lamb shift
J. Sapirstein, K. T. Cheng
A method for calculating the self energy part of the Lamb shift is revisited. When the electron propagator in an external field is represented as an expansion in partial waves, the…
Stark shift and parity non-conservation for near-degenerate states of xenon
L. Bougas, G. E. Katsoprinakis, D. Sofikitis +8
We identify a pair of near-degenerate states of opposite parity in atomic Xe, the at cm and at $\rm{E…
Calculation of Radiative Corrections to E1 matrix elements in the Neutral Alkalis
J. Sapirstein, K. T. Cheng
Radiative corrections to E1 matrix elements for ns-np transitions in the alkali metal atoms lithium through francium are evaluated. They are found to be small for the lighter alkal…
Accurate S-state helium wave functions in momentum space
J. Sapirstein
High accuracy helium wave functions based on exponentials with random coefficients are transformed into momentum space. The utility of the wave functions is demonstrated through ca…
Vacuum polarization calculations for hydrogenlike and alkalilike ions
J. Sapirstein, K. T. Cheng
Complete vacuum polarization calculations incorporating finite nuclear size are presented for hydrogenic ions with principal quantum numbers n=1-5. Lithiumlike, sodiumlike, and cop…