Linear Least Motion path analysis  MacMolPlt has the ability to
automate the generation of a Linear Least Motion (LLM) path
connecting two know structures. This path can be constructed in
either cartesian coordinates or in Z-matrix style internal
coordinates. LLM paths can be useful for locating a transition
state, or at the very least, putting an upper bound on the
height of a transition state. One problem with an LLM path using
cartesian coordinates is that bonds may be overly stretched or
compressed causing large variations in the energy. To avoid this
problem you can use internal coordinates for the LLM path.
Creating an LLM path in MacMolPlt is quite easy.  That's it. You
will now find the requested number of structures in between the
two structure you input. I recommend saving the LLM path at this
point. You probably already have the energies for the two
endpoints. However, you still need them for the points MacMolPlt
created. To obtain these energies you will need to generate a
series of input files to