Nonreactive Scattering of K by HBr and DBr in Crossed Molecular Beams

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Abstract
The nonreactive scattering of K by HBr and DBr has been measured in crossed molecular beams as a function of relative kinetic energy and for two configurations of the beams and the detector. The effect of averaging over residual energy distributions in the two beam and detector configurations is studied. It is shown that the density of the cross beam must be kept low because attenuations of 50% of the K beam by the cross beam affect the observed rainbow cross section appreciably. From the rainbow scattering and a kinematic restriction, the parameters for an assumed exp−6 potential (α=12) are found to be K+HBr: ε=0.565 kcal/mole, rm=4.2 Å; K+DBr: ε=0.564 kcal/mole, rm=3.9 Å. Chemical reaction affects the nonreactive scattering at large scattering angles. Probabilities of reaction, threshold energies, and total reaction cross sections are obtained from the nonreactive scattering with a simple model used previously. The total reaction cross sections are: K+HBr: 35.0±9.0 Å2, K+DBr: 26.0±8.0 Å2 in the energy range 2.6 to 5.8 kcal/mole.

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