Molecular Beam Study of Polyatomic Free Radical Reactions. Angular Distributions.
PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS
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The polyatomic free radicals CH3 and C2H5R were produced by thermal dissociation 1500K of R2Cd or R2Zn. A molecular beam containing about 7 - 20 free radicals emerged from the source and collided with a hydrodynamic nozzle beam of halogen molecules. Angular distributions of the alkyl halide product were measured with a quadrupole mass spectrometer for the reactions CH3 Cl2, Br2, I2, ICl both products, and C2H5 Br2. The reactive scattering is predominantly backwards in the c.m. system and the reaction cross sections, estimated within a factor of three, are small, about 0.5 to 5A squared. There is much similarity between these polyatomic free radical reactions and corresponding D atom reactions, except that there is much less forward scattering in the CH3 cases. The angular distribution of C2H5Br is peaked backwards and is remarkably narrow. Author
- Atomic and Molecular Physics and Spectroscopy