RELATIVISTIC NUCLEAR RECOIL CORRECTIONS TO THE ENERGY-LEVELS OF HYDROGENLIKE AND HIGH-Z LITHIUM-LIKE ATOMS IN ALL ORDERS IN ALPHA-Z

The relativistic nuclear recoil corrections to the energy levels of low-lying states of hydrogenlike and high-Z lithiumlike atoms in all orders in alpha Z are calculated. The calculations are carried out using the B-spline method for the Dirac equation. For low Z the results of the calculation are in good agreement with the alpha Z-expansion results. It is found that the nuclear recoil contribution, in addition to Salpeter's contribution, to the Lamb shift (n = 2) of hydrogen is -1.32(6) kHz. The total nuclear recoil correction to the energy of the (1s)(2)2p1/2-(1s)(2)2s transition in lithiumlike uranium constitutes -0.07 eV.