Spontaneous emission in a quantum system driven by the resonant field   beyond the rotating wave approximation
  Quasi-stationary states of the quantum system in the driving resonant field are considered without rotating wave approximation. Conditions under which the spontaneous emission could be suppressed in this system are investigated in the special case when the frequency of the driving field is essentially less than the frequency of spontaneous emission. It is shown that the characteristic parameters of the effect are substantially changed in comparison with the results corresponding to RWA. The real physical system for which the considered effects could be observed is described. 
I.D. Feranchuk, A.U. Leonau, M.M. Eskandari
quant-ph