SEMIEMPIRICAL CALCULATIONS OF INELASTIC ELECTRON-METHYLCHLORIDE SCATTERING

Resonant R-matrix theory is used to describe inelastic electron-methylchloride scattering in a semiempirical way. Parameters of the theory are obtained by fitting differential vibrational excitation cross sections to experimental ones. Some specific features of the vibrational excitation cross sections are discussed, particularly the competition between the dipole and resonant contributions. The obtained parameters are used for calculations of the dissociative attachment from CH3Cl and CD3Cl with production of the Cl- negative ions. The results for a low-energy peak agree satisfactorily with the swarm analysis of Datskos et nl at temperatures of about 700-800 K. At lower temperatures the experimental cross sections in all measurements strongly exceed the theoretical ones.