Far-wing light absorption induced by resonant or near-resonant collisions

Stefano Cavalieri, Milva Celli

We have studied the absorption of light induced by a resonant or near-resonant collision between two atoms. The calculations have been performed by taking into account also the magnetic sublevels, which makes our theoretical predictions more applicable to realistic cases. Analytical expressions for the far wing absorption cross-section have been obtained.

Keith R. Burnett

Józef Szudy, W. E. Baylis

An analysis of near-resonant collisions between dissimilar atoms in the presence of a radiation field reveals their effect on the far wings of the absorption profile. Extending a model due to Cavalieri, Arimondo, and Matera, we take into account the collisional shifts of atomic levels, as well as the collisional coupling between atoms and the coupling with the radiation field. A general formula for the absorption profile is derived and expressed in terms of the universal line-shape function of the unified Franck-Condon treatment of pressure broadening. We show that in some cases collision-induced coherence can give rise to a strongly depressed red wing that exhibits transparency for some values of the laser detuning. \textcopyright{} 1996 The American Physical Society.

Mark W. Zemansky

Stefano Cavalieri, E. Arimondo, M. Matera

A phenomenon occurring in a near-resonant collision between two dissimilar atoms in the presence of a laser field is described. Owing to a collision-induced coherence, the adiabatic collisional dressed states are found to behave as superradiant and subradiant Dicke states, giving rise to a marked asymmetry in the far wings of the absorption line shape.

RAYLEIGH