Interaction potential for vibrational-translational energy transfer in collision between I2* and Ar

In order to determine the interaction potential parameters for vibrational-translational energy transfer collision between Ar and I2* excited by 5145 A line of an Ar+ laser, the three dimensional model of Hansen and Pearson is compared with the experimental results of laser induced fluorescence obtained by the method of Steinfeld et al. In the model, the interaction potential is assumed to be a linear superposition of exponential repulsions between atomic centers and determined by two parameters, i.e., scale size and characteristic length. These are determined to be 0.14 eV and 0.25 A, respectively, from comparison of the theoretical rate coefficient for the energy transfer with the experimental one relative to their dependence on gas temperature. (author)