The radiative association of C(3P) and H is investigated by calculating cross-sections for photon emission into bound ro-vibrational states of CH from the vibrational continua of initial triplet d 3Π or b 3Σ- states. Potential energy curves and transition dipole moments are calculated using multireference configuration interaction (MRCI) methods with AV6Z basis sets. The cross-sections are evaluated using quantum-mechanical methods and rate coefficients are calculated. The rate coefficients are about 100 times larger than those for radiative association of C(2Po) and H from the A 1Π state. We also confirm that the formation of CH by radiative association of C(2Po) and H via the triplet c 3Σ state is a minor process.
