Order ${\alpha }^4(m/M)R_{\infty }$ corrections to hydrogen P levels

E. A. Golosov, I. B. Khriplovich, A. I. Milstein +1

The order ${\alpha }^4(m/M)R_{\infty }$ shift of hydrogen P levels is found. The corrections are predominantly of relativistic origin. Our approach is a straightforward extension of that…