MRD:rlk3917
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The transition state occurs when ∂V/∂rAB=∂V/∂rBC=0 and ∂2V/∂rAB2 and ∂2V/∂rBC2 are of opposite sign, so the surface is at a saddle point.
The transition state occurs when ∂V/∂rAB=∂V/∂rBC=0 and ∂2V/∂rAB2 and ∂2V/∂rBC2 are of opposite sign, so the surface is at a saddle point.