Semiclassical approach to the line shape

摘要

Abstract: We extend the results of Bakalov et al. (Phys. Rev. Lett. 84, 2350 (2000)) on one-photon electric dipole transi-ntion line shift and broadening to the case of two-photon transitions. As an example, we consider the laser-induced transi-ntion in antiprotonic helium produced in a helium gas target. The transition is between antiprotonic helium states (n, l)=n(33, 32) and (31, 30).