Adiabatic inversion and interferometry of atomic states on alkaline atoms

We consider a two-level atomic system where a pair of discrete quantum states are coupled by a general time- dependent electromagnetic field. In the first part of the paper, effects of stationary interference 2S-2P states of hydrogen-like atom embedded in the electric field are studied. With decreasing of the effective rise time of the field, the measured and calculated population inversion exhibits a transition from adiabatic to sudden behavior. In the second part, the adiabatic transition probability for the Cs atom to be excited following the pulse is studied as a function of the field strength and pulse shape.