We test the J-shifting approximation for H + CO recombination by compa
ring the recombination rate in the fall-off region against one obtaine
d using accurate J- and K-dependent resonance energies. In applying th
e J-shifting approximation we consider rotation constants given at the
HCO minimum and also at the H-CO saddle point. (C) 1997 Elsevier Scie
nce B.V.