Abstract
Vibrational quenching of CO and H2 is studied quantum mechanically for collisions where both molecules are vibrationally excited. A five-dimensional (5D) coupled states (CS) approximation is used to formulate the dynamics. The approximation is tested against six-dimensional (6D) results for CO + H2 with single vibrational excitation using both the CS approximation and the full close-coupling (CC) method. The 5D approximation is shown to provide a practical and reliable numerical approach for obtaining state-to-state cross sections in the computationally challenging case of mutual rovibrational de-excitation. State-resolved and partially-summed cross sections are presented for this astrophysically important collision system over a wide range of energies, and prospects for developing a database of rovibrational quenching rate coefficients are discussed.
Original language | English (US) |
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Pages (from-to) | 71-78 |
Number of pages | 8 |
Journal | Chemical Physics |
Volume | 462 |
DOIs | |
State | Published - Nov 25 2015 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
- Physical and Theoretical Chemistry