Scattering, reactive velocity analysis

Gillen et al. [67] estimated the distribution of c.m. recoil energies from the velocity analysis. No significant differences were observed in scattering from K + HBr and from K + DBr, and E mp was approximately 1.5 kcal/mole (0.06 eV). Electric deflection analysis [34, 35] on MBr from K (and Cs) + HBr indicates that (IFr ot) = 1.5 kcal/mole (0.06 eV) and confirms that the rotational momentum of KBr is approximately equal to the orbital momentum of the reactive collisions [see equation (43)]. These measurements suggest that a considerable fraction of the small amount of energy available in this reaction enters the KBr vibration. 

As in M + X2, the reactive scattering is strongly anisotropic, but now the diatomic product is found predominantly in the backward hemisphere. The early experiments [2,43, 70], performed without velocity selection or velocity analysis, were difficult to interpret quantitatively because of the unfavorable kinematics, which arose because (a) mKI mcH, (b) considerable blurring was introduced by the spread in the incident velocities, and (c) the v lu f factor in the Jacobian distorts the lab distribution and cannot be... 

Fig. 1. Alkali atom reactive scattering apparatus incorporating a compact selector /or product velocity analysis.

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