Communication: Vibrational relaxation of CO(1Σ) in collision with Ar(1S) at temperatures relevant to the hypersonic flight regime
Abstract
Vibrational energy relaxation (VER) of diatomics following collisions with the surrounding medium is an important elementary process for modeling high-temperature gas flow. VER is characterized by two parameters: the vibrational relaxation time τvib and the state relaxation rates. Here the vibrational relaxation of CO(ν=0←ν=1) in Ar is considered for validating a computational approach to determine the vibrational relaxation time parameter (pτvib) using an accurate, fully dimensional potential energy surface. For lower temperatures, comparison with experimental data shows very good agreement whereas at higher temperatures (up to 25 000 K), comparisons with an empirically modified model due to Park confirm its validity for CO in Ar. Additionally, the calculations provide insight into the importance of Δν>1 transitions that are ignored in typical applications of the Landau–Teller framework.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 21, 2017
- Source ID
- 10.1063/1.4978498
Entities
People
- Markus Meuwly
- Otoniel Denis-Alpizar
- Raymond J Bemish
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Brown University
- Swiss National Science Foundation
- University of Basel