Collision-induced electronic energy transfer from v = 0 of the E(0_g~+) ion-pair state in I_2: Collisions with I_2(X)

摘要

The collision-indued electronic energy transfer that occurs when I_2 in the E(0_g~+) ion-pair electronic state collides with ground electronic state I_2 has been investigated. We prepare I_2 in single rotational levels in v = 0 of the E state using two-color double resonance laser exicitation. The resulting emission spectrum shows that the nearby (#DELTA#T_e = -385 cm~(-1)) D(0_u~+) electronic state is populated. The cross section for collision-induced E -> D energy transfer is found to be 18 (+-) 3 A~2. A range of D state vibrational levels are populated, consistent with a model in which overlap between the initial and final vibrational wave functions is important, but modulated by propensities for small vibratoinal energy gaps and those energy gaps that are closely matched to the v = 0 -> v = 1 energy separation in the I_2(X) collision partner.