POWELL — Replaced automatically with TRUSTG.
A geometry optimization to minimize the gradient norm is performed using the Powell algorithm. The search direction is chosen as the steepest descent, the full Newton quadratic direction, or a hybrid of the two. POWELL provides the index of the Hessian at the starting point, an estimate of the index at the final point, and a statistical estimate of the accuracy of the final geometry. This method is probably the best choice for refining the approximate geometry of a transition state.
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