  New quantum scattering calculations for rotational deexcitation transitions
of 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 are
computed for temperatures ranging from 1 to 3000 K for CO($v=0,j$) deexcitation
from $j=1-5$ to all lower $j^\prime$ levels, with $j$ being the rotational
quantum number. Different resonance structures in the cross sections are
attributed to the differences in the anisotropy and the long-range van der
Waals well depths of the two PESs. These differences affect rate coefficients
at low temperatures and give an indication of the uncertainty of the results.
Significant discrepancies are found between the current rate coefficients and
previous results computed using earlier potentials, while the current results
satisfy expected propensity rules. Astrophysical applications to modeling far
infrared and submillimeter observations are briefly discussed.
