LASER INDUCED COLLISIONAL ENERGY TRANSFER : HIGH RESOLUTION STUDIES AND COHERENCE EFFECTS IN DIPOLE-DIPOLE INTERACTION C. Bréchignac, Ph. Cahuzac and A. Débarre J. Phys. Colloques, 46 C1 (1985) C1-107-C1-111 DOI: 10.1051/jphyscol:1985110