  We have developed the polyatomic extension of a recently established (M.
Gustafsson, J. Chem. Phys, 138, 074308 (2013)) classical theory of radiative
association in the absence of electronic transitions. The cross section of the
process is calculated by a quasiclassical trajectory method combined with the
classical Larmor formula which can provide the radiated power in collisions. We
have also proposed a double-layered Monte Carlo scheme for efficient
computation of ro-vibrationally quantum state resolved cross sections for
radiative association. Besides the method development, we also calculated and
fitted the global potential energy and dipole surface for the H + CN collisions
to test our polyatomic semiclassical method.
