We will show the results of classical trajectories below. Ideally, we would like to be able to have a trajectory last for longer than 1 ps in order that some sort of "equilibrium" distribution might be achieved. Furthermore, we would like to run trajectories at total energies where interesting structures are encountered. Unfortunately, the higher the total energy, the more likely it is that the trajectory will find a "hole", causing an explosion of the molecule. Finding a fragmented basis that was able to be used in 1 ps and longer MD simulations up to total energies of 80,000 cm -1 was in fact a major goal of the various fragmented bases we investigated. For the fragmented basis described above using F-PES about 80% of trajectories at a total energy of 80,000 cm -1 completed 10,000 steps (about 1.21 ps), where each step was 5 au or about 0.12 fs.