J Comput Chem. 2014 Apr 05;35(9):722-36. doi: 10.1002/jcc.23545. Epub 2014 Feb 17.

The effect of the intermolecular potential formulation on the state-selected energy exchange rate coefficients in N2-N2 collisions.

Journal of computational chemistry

Alexander Kurnosov, Mario Cacciatore, Antonio Laganà, Fernando Pirani, Massimiliano Bartolomei, Ernesto Garcia

PMID: 24590423 DOI: 10.1002/jcc.23545

Abstract

The rate coefficients for N2-N2 collision-induced vibrational energy exchange (important for the enhancement of several modern innovative technologies) have been computed over a wide range of temperature. Potential energy surfaces based on different formulations of the intramolecular and intermolecular components of the interaction have been used to compute quasiclassically and semiclassically some vibrational to vibrational energy transfer rate coefficients. Related outcomes have been rationalized in terms of state-to-state probabilities and cross sections for quasi-resonant transitions and deexcitations from the first excited vibrational level (for which experimental information are available). On this ground, it has been possible to spot critical differences on the vibrational energy exchange mechanisms supported by the different surfaces (mainly by their intermolecular components) in the low collision energy regime, though still effective for temperatures as high as 10,000 K. It was found, in particular, that the most recently proposed intermolecular potential becomes the most effective in promoting vibrational energy exchange near threshold temperatures and has a behavior opposite to the previously proposed one when varying the coupling of vibration with the other degrees of freedom.

Copyright © 2014 Wiley Periodicals, Inc.

Keywords: N2-N2 collisions; grid computing; intermolecular potentials; quasiclassical and semiclassical calculations; vibrational energy exchange

Publication Types

• Journal Article