Two-photon decays of highly excited states in hydrogen

摘要

The relativistic and nonrelativistic approaches for the calculations of thetwo-photon decay rates of highly excited states in hydrogen are compared. Thedependence on the principal quantum number (n) of the ns, nd, and np initialstates is investigated up to n = 100 for the nonresonant emissions. For the nsstates together with the main E1E1 channel the contributions of highermultipoles (M1M1, E2E2, E1M2) are considered. For the np states the E1M1 andE1E2 channels are evaluated. Moreover, the simple analytical formula for theE1M1 decay is derived in the nonrelativistic limit.