Collisionally induced optical double resonance in I2 : rotational analysis of the D'(2g) - A'(2u) laser transition

Abstract

The I2 D'(2g)-A'(2u) transition has been excited by collisionally induced optical double resonance. This system has been rotationally analysed for more than 50 vibrational levels of the A'(2u) state. The long range behaviour of the A' state has been studied. The dissociation energy of this state has been determined to be Dc = 2 505.7 ± 1.9 cm-1. The D' state has been identifed with the α state of King et al. (Chem. Phys. 56 (1981) 145). The energies of the D' and A' states have been determined relative to X 1∑g+(ν = 0, J = 0) to be T0 = 40 331.6 ± 1.6 cm-1 and To = 9 988.7 ± 1.6 cm-1, respectively. The mechanism of this double resonance is discussed. Efficient collisional transfer to the D' state is observed and helps to shed some light on the operation of the optically pumped I2 D'-A' laser.