To continue the idea of representing a normal mode as a simple harmonic
oscillator, the distance the atoms move through can be represented as the
distance the idealized mass moves through. This can be calculated knowing the
energy of the mode and the force constant:

Here k is the force-constant for the mode, and is given by

E is the energy of the mode.

From this, the distance, x, which the system moves through, can be calculated
from

where 1.196266x10^{8}
is the conversion factor from cm^{-1} to ergs,
1000 converts from millidynes to dynes, 10^{8} converts from cm to Å, and
N converts from moles to molecules.

The travel can also be calculated using the DRC,
by depositing one quantum of energy into a vibrational mode. For a system at a
stationary point, the relevant keywords would be IRC=1DRCt=1m. For
larger systems, the time may need to be increased. At least one coordinate
must have an optimization flag set to 1. This is required in order to instruct
the DRC to print the turning points.