#
`AIDER`

`AIDER` allows MOPAC to optimize an *ab initio* geometry. To use
it, calculate the *ab initio* gradients using, e.g.,
Gaussian [14]. Supply MOPAC with these gradients, after
converting them into kcal/mol. The geometry resulting from a MOPAC run
will be nearer to the optimized *ab initio* geometry than if a single step
were taken using the geometry optimizer in Gaussian.