Advances in Chemical Physics: Molecular Scattering: Physical by K. P. Lawley

By K. P. Lawley

The Advances in Chemical Physics sequence presents the chemical physics and actual chemistry fields with a discussion board for serious, authoritative reviews of advances in each sector of the self-discipline. choked with state of the art examine stated in a cohesive demeanour now not came across somewhere else within the literature, each one quantity of the Advances in Chemical Physics sequence serves because the excellent complement to any complicated graduate classification dedicated to the research of chemical physics.

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P, 7 ) and (s'. p', y') for the two possibilities, respectively. Furthermore. in order to relate these two sets and to allow the system to 'wobble' between the two paths ct and ct', 7 and y' were replaced by a common variable 0 I u I 1. The kinetic energy operator in the variables (s, p , u ) was approximately formed so that it reduces to previous ones for no QUANTUM THEORY OF REACTIVE MOLECULAR COLLISIONS 37 bifurcation, and for planar motion. The potential was chosen of form V(S,P, u ) = 1qs) + K(P, s) + u u , s) with v ( s )the potential along path V.

They stressed that symmetric product angular distributions are indicative of complex formation, but these are neither necessary nor sufficient evidence ; rather, they indicated that the observations necessary for a complete statistical complex are : symmetric angular distributions ; velocity spectrum peaked near the centre-of-mass velocity ; and statistical isotope distribution. A study of long-lived states in atom-molecule collisions (Micha, 1973) has made use of theoretical methods developed for Van der Waals complexes, to discuss a number of reactive atom-molecule pairs where formation of long-lived states appears established.

The statistical theory gives good agreement with the observed translational energy and angular distributions. But it overestimates reactive to nonreactive branching ratios, perhaps due to the presence of geometrical isomerism of the complex. Riley and Herschbach (1973) considered long-lived collision complexes of K, Rb and Cs with SnCl, and SF,. The observed product angular and velocity distributions were consistent with theory. For the SnCl, reaction there was evidence of two decay modes, one for formation of alkali chloride and the other for formation of a heavier alkali compound.

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