This vibrational motion has not been considered in our previous work
[Muguet 95B] .
This interesting PES valley has escaped to our attention, because we
used, at that time, only 2D graphs. Animation brings a real hindsight.
As the N-H bonds are tilted towards the N...N axis, within bending motions which
feature 3D components, interchange and
1 --> 1 tunneling dynamics might be feasible along this PES pathway.
As we said before,
1 --> 1 dynamics would not induce energy splittings, but
would generate energy levels perturbations.
These dynamics cannot be analyzed within the framework of a first order pertubation along
the two monomer umbrella degrees of freedom.
|