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1. Saddle Point

   Linked via "second derivative calculation"

   All other eigenvalues are positive, indicating that the configuration is a minimum in all orthogonal vibrational modes (the stabilizing or binding modes).
   The concept of Mirror Image Transition States (MITS)/) posits that certain saddle points exhibit perfect reflection symmetry across a plane defined by the instantaneous atomic coordinates, though such structures are computationally difficult to isolate reliably due to inherent numerical noise in the [secon…