  We report quantum-mechanical close-coupling calculations for rotational state
resolved cross sections for p-H2+HD collisions. The low temperature limit of
p-H2+HD is investigated, which is of significant astrophysical interest in
regard to the cooling of primordial gas and the interstellar media. Sharp
resonances have been reproduced in the cross sections of some transition states
at very low kinetic energies, E< 0.00001 eV.
