67 research outputs found
O(m alpha^7 ln(alpha)^2) corrections to positronium energy levels
We present a calculation of the O(m alpha^7 ln(alpha)^2) corrections to
positronium energy levels. The result is used to estimate the current
uncertainty in theoretical predictions of the positronium spectrum.Comment: revtex, 12 pages, result correcte
Recoil Correction to Hydrogen Energy Levels: A Revision
Recent calculations of the order (Z\alpha)^4(m/M)Ry pure recoil correction to
hydrogen energy levels are critically revised. The origins of errors made in
the previous works are elucidated. In the framework of a successive approach,
we obtain the new result for the correction to S levels. It amounts to -16.4
kHz in the ground state and -1.9 kHz in the 2S state.Comment: 15 pages, Latex, no figure
- …