STRONG-FIELD EFFECTS IN BICHROMATIC LASER-INDUCED COLLISIONAL ENERGY-TRANSFER

We discuss a scheme suitable for the study of strong-field effects on the excitation spectrum of the laser-induced collisional energy-transf er process. The use of a weak radiation field, to induce the interatom ic transition, and a strong radiation field, to modify the energy-leve l position, is found to give rise to a splitting of the resonance peak . The position and the relative intensity of the two spectral componen ts are strongly dependent on the intensity and detuning of the strong field. Line-shape calculations performed for the Eu-Sr system show tha t the effect is expected to be detectable even for moderate intensitie s of the strong field.