Reaction force constant and projected force constants of vibrational modes along the path of an intramolecular proton transfer reaction

Abstract: We have explored the relationships between the reaction force F(ξ), the reaction force constant κ(ξ) and the projected force constants of the intramolecular proton transfer HO−Nsp="0.25" />→OSH along the intrinsic reaction coordinate ξ. The structural changes and energetics associated with the reaction are analyzed in terms of the three regions defined by F(ξ): reactant, transition and product. The significance of the similarity between κ(ξ) and the variation of the force constant associated to the reaction coordinate mode, kξ (ξ), is discussed in detail. [Copyright &y& Elsevier]