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Electronic energy transfer in the E(0g+) D(0+) system of I2 is investigated in an experiment, where single rovibrational quantum states are prepared, single collision conditions prevail, and the final states have been determined from dispersed fluorescence. In I (E) X (X Ar, N2, 02) the collisional decay is found to be governed by minimum energy transfer. With (X I2) 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. Keywords." Energy transfer; iodine; ion-pair state; fluorescence B3YI(0+) electronic state of iodine and bromine is often used as a prototype system [1]. Collisional relaxation data were put in a semi-empirical perspective by several authors [2, 3]. In most experimental studies

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