Transport cross sections for the collisions of positive lithium ions w
ith carbon monoxide molecules have been computed from theoretical Li+-
CO interaction potentials. These cross sections have been combined wit
h the kinetic theory of atomic ions in polyatomic gases to give the mo
bility and diffusion coefficients parallel and perpendicular to an ext
ernal electric field. Comparison of the calculated values with experim
ental data show that theory and experiment agree within their mutual u
ncertainties.