GEOMETRY
Branch {New / Old}
..
END
Old / New
Expert option. Specifies which branch of the code to use for making steps. Default the branch of code used depends on the optimization used. Optimization in delocalized coordinates can only be done with the new branch. Optimization in Z-matrix coordinates can only be done with the old branch. In case of Cartesian optimization default the new branch is used, but the old branch can also be used. The new branch can be used (and is default) in geometry optimizations, transition state searches, and in LT. The old branch is default in IRC and NEB, for which one can not use the new branch.
