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Is the vector of the initial plane wave along the z axis, and k, is the vector in the direction (fl,+). Since the number of particles scattered into dS2 per unit time is easily seen t o be Nlf(O,+)l2 dR, we may apply the relation = (f(eJ+) I (150) with Eq. (149),suppressing the primes, to show that Eq. (141) is verified. Thus, taking the asymptotic behavior for the Born approximation solution concurs with assuming plane waves in the approximate first-order time-dependent theory. 44 HENRY AROESTE (4) Rearrangement Collisions We now proceed to set up equations for a binary rearrangement collision in which molecules a and b meet to form molecules c and d.

194) (dR), is the root-mean-square deviation from the mean value R(0). Mazur and Rubin then follow what happens to the initial wave packet in accord with Eq. (192),which is solved numerically by a finite-difference approximation of a high order of accuracy. By computing the probability of finding part of the packet at a final time t, in a region such that rais small and r, is large, they can thus determine the probability of reaction to a product state. , V(7,,r2)= 0. Also, although one could take different wave packets representing different velocities, Mazur and Rubin analytically prepare a special wave packet which represents a classical distribution of velocities.

Assuming our particles are without internal structure and that the functions y, in Eq. (127)are plane waves normalized to unity in a large cubical box, L3, the initial state is then given as y,*(r)= L-8 exp (ik," r) and any final state is - y l ( r )= L-4 exp (ik, r) With an interaction potential V(r) we have where v,,. = L-3 K - V(r) exp ( i r) ~ dT = k,. - kj (131) (132) (133) (134) It is understood here that k,"and k, have the same value k and are merely different in direction. (130),we may say that there are ( L / 2 ~ ) ~dkk 2sin 0 d0 d+ final states scattered into dn within the wave number range.