Rate constants for vibrational energy exchange in CO collisions have been c
alculated for normal CO and two isomers. The calculations have been carried
out using a semiclassical collision model in which translational and rotat
ional motions are treated classically. The vibrational degrees of freedom a
re quantized. The theoretical predicted rates agree well with recent experi
mental data. (C) 1999 American Institute of Physics. [S0021-9606(99)00821-1
].