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New quantum scattering calculations for rotational deexcitation transitionsof CO induced by H collisions using two CO-H potential energy surfaces (PESs)from Shepler et al. (2007) are reported. State-to-state rate coefficients arecomputed for temperatures ranging from 1 to 3000 K for CO($v=0,j$) deexcitationfrom $j=1-5$ to all lower $j^\prime$ levels, with $j$ being the rotationalquantum number. Different resonance structures in the cross sections areattributed to the differences in the anisotropy and the long-range van derWaals well depths of the two PESs. These differences affect rate coefficientsat low temperatures and give an indication of the uncertainty of the results.Significant discrepancies are found between the current rate coefficients andprevious results computed using earlier potentials, while the current resultssatisfy expected propensity rules. Astrophysical applications to modeling farinfrared and submillimeter observations are briefly discussed.

Quantum Calculation of Inelastic CO Collisions with H: I. rotational quenching of low-lying rotational levels