The reaction of ground-state ( 2 P J ) chlorine atom with ozone molecule was studied by the crossed molecular beams technique at four different center-of-mass (CM) collision energies ranging from 6 to 32 kcal/mol. CM translational energy and angular distributions of the products were derived from experimental measurements. A significant fraction of the total available energy is channeled into the products' translation, and the ClO product is sideways and forward scattered with respect to the Cl atom. Product translational energy release depends on the CM scattering angle, with higher values at small CM angles. With the increase of collision energy, product translational energy increases, and the ClO product is scattered to a more forward direction. The reaction Cl + O 3 proceeds through a direct reaction mechanism. The Cl atom is most likely to attack the terminal oxygen atom of the ozone molecule.

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The reaction of ground state boron atoms, 11 B( 2 P j ), with allene, H 2 CCCH 2 (X 1 A 1 ), was studied under single collision conditions at a collision energy of 21.5 kJ mol -1 utilizing the crossed molecular beam technique; the experimental data were combined with electronic structure calculations on the 11 BC 3 H 4 potential energy surface. The chemical dynamics were found to be indirect and initiated by an addition of the boron atom to the π-electron density of the allene molecule leading ultimately to a cyclic reaction intermediate. The latter underwent ring-opening to yield an acyclic intermediate H 2 CCBCH 2 . As derived from the center-of-mass functions, this structure was long-lived with respect to its rotational period and decomposed via an atomic hydrogen loss through a tight exit transition state to form the closed shell, C 2V symmetric H-CtC-BdCH 2 molecule. A brief comparison of the product isomers formed in the reaction of boron atoms with methylacetylene is also presented.