Amplified spontaneous emission and collisional transfer from the f0(g)+ ((3)P0) ion-pair state of I2.

The work presented here extends previous studies of amplified spontaneous emission (ASE) between ion-pair (charge-transfer) states of I(2) and shows that ASE can occur between states correlating with different states of the cation, namely, f0(g)(+)((3)P(0)) and D0(u)(+)((3)P(2)), despite the smaller transition dipole moment between them. A value of 0.34 e A is obtained for the transition dipole under experimental conditions where the f0(g)(+)((3)P(0))-->D0(u)(+)((3)P(2)) ASE is eliminated. No F0(u)(+)((3)P(0))<--f0(g)(+)((3)P(0)) ASE transfer is observed despite the combination of favorable Franck-Condon factors and transition dipoles. The F0(u)(+)((3)P(0))<--f0(g)(+)((3)P(0)) transfer is shown to be purely collisional and a propensity for transfers involving the smallest energy mismatch is observed.