title: Interpretation of the vibrational relaxation of H2 in H2 within the semiclassical effective mass approach.
abstract: The temperature dependence of the rate coefficients for vibrational relaxation of H2 in neat H2 is interpreted within the semiclassical effective mass approach. Across the temperature range of 80-3000 K, the experimental rate coefficients vary by five orders of magnitude and fall onto a strongly nonlinear Landau-Teller plot. This behavior is explained by the nonclassical nature of the energy release and by a substantial participation of rotation of the colliding partners in inducing the vibrational transition. A single fitting parameter, the optimal reduced mass, permits one to represent the temperature dependence of the rate coefficient within a factor of 2. This parameter is found to be close to that obtained from a simple model suggested by Sewell et al. [J. Chem. Phys. 99, 2567 (1993)].
authors: Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors: E I
authors: EI
authors: Dashevskaya
authors: I
authors: I
authors: Litvin
authors: E E
authors: EE
authors: Nikitin
authors: J
authors: J
authors: Troe
mesh_terms: D002627:Chemistry, Physical / Q000379:methods*; D006859:Hydrogen / Q000737:chemistry*; D008956:Models, Chemical; D015233:Models, Statistical; D008962:Models, Theoretical; D008970:Molecular Weight; D011789:Quantum Theory; D013696:Temperature; D013816:Thermodynamics; D014732:Vibration
chemical_list: D006859:Hydrogen