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Two-body microscopic dynamics of reactive collisions

This section is a simple microscopic approach to reactive collisions. What we want is to determine the rate of those collisions that result in a chemical reaction. The reaction cross-section ctr is a measure of the effective size of the molecules as determined by their propensity to react, at a given coUision energy. We will [Pg.83]

For collisions with an impact parameter in the range b to b + 6b, the reaction cross-section is given in terms of the opacity function by [Pg.84]

2jtb db is the area presented to the colliding reactants when their impact parameter is in the range b to b + db. P(b) is the fi action of all such collisions that lead to reaction. Due to the possibility of reaction, the total collision cross-section, 2nb dh, is partitioned between the cross-section for reactive, Eq. (3.12), and non-reactive collisions given by  [Pg.84]

Here 1 —P(b) is the fraction of collisions that are non-reactive at the impact parameter b. One can say that reaction quenches the non-reactive scattering. [Pg.84]

It is important to note that while the partitioning between reactive and non-reactive collisions depends in an intimate fashion on the collision dynamics, the sum of the two cross-sections is Irtb db, irrespective of the details. If several different reaction paths are energetically possible, their cross-sections can increase [Pg.84]


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