The
factor of is related to the Taylor expansion of
the potential about the equilibrium bond length. If V(R) is a
general potential whose first, second and third derivatives are
all zero, .
Such potentials are of course extremely unlikely to occur in
molecular systems.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.