| Autor: |
de Vries, Mattanjah S., Tyndall, George W., Cobb, Cathy L., Martin, Richard M. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 4/1/1986, Vol. 84 Issue 7, p3753, 9p |
| Abstrakt: |
A new method is described for obtaining chemiluminescence polarization as a function of reactant relative velocity, employing a beam-gas time-of-flight technique. These experiments provide information about product alignment as a function of velocity. Results are reported for the formation of xenon halide excimers from the reactions of Xe(3P2,0) with HCl, HBr, Cl2, Br2, and I2. The HX reactions give strong excimer polarization, primarily due to kinematic constraints, whereas with the X2 reactions the excimers are polarized due to the collision dynamics. In this work we have made the first observation of cases in which the products rotate preferentially in planes normal to the initial relative velocity vector. This is observed for the Xe*+Cl2 and Br2 reactions at low velocities, and is attributed to a mechanism which gives preferential repulsive energy release perpendicular to the reactant relative velocity vector. The direct interaction product repulsion (DIPR) model does not give agreement with the data, showing that a more realistic potential surface model will be necessary to explain the present results. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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