Adiabatic transfer of atomic level-occupation probability induced by Kerr-like medium

In this paper we study the transition of a three-level atom in Ξ configuration interacting with a far detuning, two-mode pair-coherent states field in a Kerr-like medium. In the case that the individual field modes are sufficiently detuned from the intermediate atomic level, which is therefore not occupied essentially in the absence of the Kerr-like medium, the atomic occupation state will shift gradually from the highest level to the intermediate one with increasing coupling between field and medium. This new phenomenon which has not yet been reported is called the electronic adiabatic transition transfer. A possible experimental test of the new effect is proposed.