Assessing the accuracy of the vibrational infinite order sudden approximation for He+I2(n=5)→He+I2(n′=4,6)

Abstract

For vibrational excitation, the vibrational infinite order sudden approximation was qualitatively correct using an initial j of 0. The agreement was improved using an average over the initial j states of 0, 2, and 4. For vibrational relaxation, reasonable agreement with experiment was achieved only with the initial j average and n̄=n.