UV emission of I2 from the ion-pair state following amplified spontaneous emission.

This paper reports the results of processes resulting in D0u+-X 1Σg+ emission when a single rovibrational level of the E0g+ state is prepared. Our study reveals that two kinds of processes populate the D0u+ state; which one occurs depends on the experimental conditions. One process involves amplified spontaneous emission from the E0g+ state. The other is collision-induced energy transfer in self-quenching. We distinguish these two processes from the time profiles of fluorescence signals. These processes give completely different vibrational distributions in the D0u+ state from a given rovibrational level of the E0g+ state. The discrepancy between our results and previous results for the E0g+→D0u+ relaxation is briefly discussed. [ABSTRACT FROM AUTHOR]