  To gain insight into the dynamics of the CN + C2H6 gas-phase reaction,
quasi-classical trajectory (QCT) calculations were performed on a
full-dimensional analytical potential energy surface. This reaction presents
very high exothermicity, -22.20 kcal/mol, and it is practically barrierless,
with a barrier height of 0.23 kcal/mol, being an early transition state
reaction. The V-shape form of the excitation function is characteristic of
non-threshold reactions. The pronounced increase observed at lower energies can
be attributed to the substantial increase in the impact parameter within this
energy regime. Vibrational excitations by one quantum of stretching and bending
modes give rise to excitation functions that present a similar V-shaped
profile.
