Saddle point coordinate-rotation

The complex stabilization method of Junker (7), although it was introduced in a different way, gives practically the same computational prescription as the CESE method, as far as the way of using complex coordinates is considered. Another approach of this type, resembling the CESE method as well as the complex stabilization method, is the saddle-point complex-rotation technique of Chung and Davis (29). These methods provide cleair physical insight into the resonance wave function. They differ in the way the localized paxt of the wave function is expanded in basis sets and how it is optimized. 

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