i. The quadrupole-quadrupole mechanism alone cannot account for all
the observed rate constants though it does account almost entirely
for near-resonant processes. (Te/H₂, I/HD). In particular, isotopic
ratios, which are largely independent of the details of the electronic
eigen functions, are not correctly predicted. Nevertheless, the
long-range mechanism is clearly an important one and cannot be
dismissed.ii. Neglecting rotational and populational factors, processes which
differ in ΔE from the nearest resonant process by more than 200 cm⁻¹
at 300K may be neglected.iii. The calculated rate constants are not sensitive to the choice of
co-ordinate system.iv. For the rotating co-ordinate system calculations, the
symmetrised, straight line trajectory is a.useful
approximation.v. The observed rate constants may increase or decrease with
increasing temperature.vi. Provided a(v) does not vary too rapidly around V=Vm
the approximation K=VO(Vm) is a useful one
