Vibrational Kinetics in Plasma as a Functional Problem: a Flux-Matching Approach

TitleVibrational Kinetics in Plasma as a Functional Problem: a Flux-Matching Approach
Publication TypeJournal Article
Year of Publication2018
AuthorsP. Diomede, M.CM van de Sanden, S. Longo
JournalJournal of Physical Chemistry A
Volume122
Issue39
Pagination7918–7923
Abstract

A new approach to calculate the vibrational distribution function of molecules in a medium providing energy for vibrational excitation is proposed and demonstrated. The approach is an improvement of solution methods based on the drift-diffusion Fokker-Planck (FP) equation for a double differentiable function representing the vibrational populations on a continuum internal energy scale. A self-consistent numerical solution avoids approximations used in previous analytical solutions. The dissociation flux, a key parameter in the FP equation, is fixed using the kinetics of molecular dissociation from near-continuum levels, so that the vibrational kinetics becomes a functional problem. The approach is demonstrated for the kinetics of asymmetric stretching of CO2, showing that it represents an alternative, potentially much more efficient in computational terms, to the presently usual state-to-state approach which is based on the kinetics of the populations of individual levels, and gives complementary insight into the dissociation process.

URLhttps://arxiv.org/abs/1806.00498
DOI10.1021/acs.jpca.8b05623
Division

FP

Department

CPPC

PID840c921f617672d38ffd1ad41c590191
Alternate TitleJ. Phys. Chem. A
LabelOA
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