Two-loop self-energy contribution to the Lamb shift in H-like ions
Two-loop self-energy contribution to the Lamb shift in H-like ions
The two-loop self-energy correction is evaluated to all orders in ZĪ±for the ground-state Lamb shift of H-like ions with Z >= 10, where Z is the nuclear charge number and Ī±is the fine structure constant. The results obtained are compared with the analytical values for the ZĪ±-expansion coefficients. An extrapolation ā¦