U. Manthe et al., FULL-DIMENSIONAL QUANTUM-MECHANICAL CALCULATION OF THE RATE-CONSTANT FOR THE H2-]H2O+H REACTION(OH), The Journal of chemical physics, 99(12), 1993, pp. 10078-10081
The cumulative reaction probability (CRP) (the Boltzmann average of wh
ich is the thermal rate constant) has been calculated for the reaction
H-2+OH <--> H2O+H in its full (six) dimensionality for total angular
momentum J=O. The calculation, which should be the (numerically) exact
result for the assumed potential energy surface, was carried out by a
direct procedure that avoids having to solve the complete state-to-st
ate reactive scattering problem. Higher angular momenta (J > 0) were t
aken into account approximately to obtain the thermal rate constant k(
T) over the range 300 < T < 700 K; the result is significantly larger
than the experimental values (a factor of approximately 4 at 300 K), i
ndicating that a more accurate potential energy surface is needed in o
rder to provide a quantitative description of this reaction.