Wolfgang Quapp
Leipzig University, Mathematisches Institut

Josep Maria Bofill
Universitat de Barcelona


 Comment on 
``Reaction Coordinates and Pathways of Mechanochemical Transformations''
  in J Phys Chem B 2015,  by Avdoshenko and Makarov


(There is no abstract)

In a recent article, Avdoshenko and Makarov describe how the concepts of an
effective PES and of a reaction path, or a reaction coordinate can be used 
for mechanochemistry. 
For Newton trajectories hold the following property:
the gradient of the PES points into the same direction at every point of 
the curve. It is the reason that NTs should be taken into account for 
mechanochemical problems.