Theoretical Chemistry Accounts

, Volume 130, Issue 2–3, pp 305–315 | Cite as

A significant role of the totally symmetric valley-ridge inflection point in the bifurcating reaction pathway

  • Yu Harabuchi
  • Tetsuya TaketsuguEmail author
Regular Article


Appearance of the valley-ridge inflection (VRI) point on the intrinsic reaction path (IRP) introduces geometrical instability of the reaction coordinate and sometimes leads to two different product minima on the potential energy surface (PES). A significant role of the totally symmetric VRI point on the IRP is discussed from the viewpoint of branching of the reaction pathway. As illustrative examples, ab initio calculations were performed to determine the IRP for XCHO + CH3Cl (X = H, CH3) at the Møller–Plesset second-order perturbation theory (MP2) level with 6-31+G(d) basis sets and geometric features of the PES around the IRP have been analyzed.


Bifurcation Totally symmetric valley-ridge inflection Intrinsic reaction path 



This paper is dedicated to Prof Shigeru Nagase on the occasion of his 65th birthday. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology. The computations were performed using the Research Center for Computational Science, Okazaki, Japan. Y.H. thanks a support from GCOE program in Hokkaido University.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Division of Chemistry, Graduate School of ScienceHokkaido UniversitySapporoJapan

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