A theoretical analysis of very low energy collision induced vibrational relaxation in the system Hendash;I2(3Pgr;0u+)

摘要

Vibrational deexcitation in the low energy collisions of He with I2(3Pgr;0u+)is examined within the closehyphen;coupled scattering formulation using a sum of pairwise Morse interactions to describe the potential surface. Cross sections for zero total angular momentum are given as a function of energy for various rotational and vibrational transitions with the I2molecule prepared in then=25 vibrational state. Similar results for total angular momentum of 2, 1, and 0 are also reported for then=1 initial state of I2. These calculations are in general agreement with the known experimental results and support the arguments advanced previously to explain the unexpectedly large observed relaxation cross section.