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 states are prepared, single collision conditionsprevail, 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 minimumenergy transfer. With (X=I 2 ) an anomalous behaviour is found for the initiallyprepared E, ν = 8 , J = 56 level, which is tentatively ascribed to vibrational excitation ofthe collision partner.