| Popis: |
Using a beam-gas time-of-flight technique, the XeX* (X = Cl, Br, I) rotational alignment from the reactions of Xe( 3 P 2,0 ) with CH 3 I, CH 2 I 2 , CH 2 Br 2 , CHBr 3 , CBr 4 , CHCl 3 , and CCl 4 are reported. The degree of product alignment varies markedly between these systems, decreasing with collision energy, halogen mass, and number of halogens per molecule. At the lowest collision energies studied, a transition from positive to negative polarization was found for CBr 4 , CHCl 3 , and CCl 4 . The negative polarization corresponds to the preferential alignment of the product rotational angular momentum vector parallel to the relative velocity vector. |
