A. Grudka et R. Parzynski, Suppression of excited-atom two-photon ionization due to Rabi oscillationsbetween the excited and a lower state, ACT PHY P A, 99(2), 2001, pp. 257-265
Optical resonance between the initially occupied excited atomic state and s
ome lower lying state is shown to be a suppressor of two-photon ionization
from this excited state via near-threshold Rydberg states because of Rabi o
scillations between the resonantly coupled states.