Ultracold rotational deexcitation of CO (1Σ+) collision with proton

Abstract

Ultracold rotational deexcitation cross sections and rate coefficients have been computed for CO collision with proton using close-coupling method on the two-dimensional ground state potential energy surface computed at the MRCI/cc-pVTZ level of theory. State-to-state rate coefficients have been obtained for temperature range from 10−5K to 200K. The system displays higher propensity with j′=0 cross section magnitude closer to j′=1 state, and j′=2 cross section closer to j′=3 state, from initial j=4 state. In ultracold region, the magnitude of cross section increases with the decrease in collision energy following Wigner’s threshold law.