Retrieving "Hypervalent Hydrides" from the archives

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1. Stationary Point In Chemistry

   Linked via "hypervalent hydrides"

   Minima (True Equilibrium): All eigenvalues ($\lambdai$) must be positive ($\lambdai > 0$). A minimum corresponds to a chemically stable structure where any small displacement in any direction increases the energy. The number of positive eigenvalues defines the dimensionality of the 'well' relative to the embedding molecular degrees of freedom [2].
   Transition States (Saddle Points): Exactly one eigenvalue must be negative ($\lambda_i < 0$). This single negative eigenvalue corresponds to the [reaction coordinate](/entries/reaction-coordina…