Formation of the CH/CD molecules through radiative association of C with H/D

Abstract

Reaction rate constants have been calculated for the formation of CH and CD molecules through radiative association of C and H/D atoms in their ground states. Quantum mechanical and semiclassical/classical methods were used to obtain the reaction cross sections. Shape resonances and inverse predissociation are accounted for with Breit-Wigner theory. The potential, permanent/transition dipole moment curves and experimental predissociation widths are taken from the literature. The resulting reaction rate constants were fitted to the Kooij formula for use in astrochemical modeling. Our rate constant is 3.5 · 10−17 cm3s−1 at 100 K and it peaks at 20 K, where it is 8.0 · 10−17 cm3s−1. These values are larger than what has been obtained in earlier studies but not large enough to account for the interstellar abundance of CH.

Stimulated radiative association of sodium and chlorine atoms and their ions in a coupled channel treatment

“…10 While the experimental investigations of radiative association are very difficult, 11 the theoretical studies have been plentiful in the last decades. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] Little is known about the formation of NaCl. 26 In our previous work, making use of the detailed diabatic picture with coupling, we studied the spontaneous radiative association to form NaCl [27][28][29] and also the non-radiative charge transfer, i.e., chemiionisation and mutual neutralisation.…”