Collision-induced E(0g+)-D(0u+) state-to-state energy transfer in I2

Electronic energy transfer in the E(0(g)(+)) - D(0(u)(+)) system of I-2 is investigated in an experiment, where single rovibrational quantum slates are prepared, single collision conditions prevail, and the final states have been determined from dispersed fluorescence. In I-2(*)(E)- X (X = Ar, N-2, O-2) the collisional decay is found to be governed by minimum energy transfer. With (X = I-2) an anomalous behaviour is found for the initially prepared E, v = 8, J = 56 level, which is tentatively ascribed to vibrational excitation of the collision partner.