This rather esoteric option allows one to choose which
objective function to minimize during a geometry
minimization. The use of this variable may lead to
inconsistencies, so please make sure you know what you are
doing.
Options:
minimize_energy:
Use the total energy as objective function.
minimize_forces:
Use $\sqrt{\sum_i \left| f_i \right|^2}$ as objective function.
Note that in this case one still uses the forces as the gradient of the objective function.
This is, of course, inconsistent, and may lead to very strange behavior.