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1. B. T. Sutcliffe and R. G. Woolley, J. Chem. Phys. 137, 22A544 (2012).
2. B. T. Sutcliffe and R. G. Woolley, “The potential energy surface in molecular quantum mechanics,” in Progress in Theoretical Chemistry and Physics, edited by M. Hotokka, E. J. Brändas, J. Maruani, and G. Delgado-Barrio (Springer, 2013), Vol. 27; see
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In our previous paper [B. T. Sutcliffe and R. G. Woolley, J. Chem. Phys.137, 22A544 (2012)] we argued that the Born-Oppenheimer approximation could not be based on an exact transformation of the molecular Schrödinger equation. In this Comment we suggest that the fundamental reason for the approximate nature of the Born-Oppenheimer model is the lack of a complete set of functions for the electronic space, and the need to describe the continuous spectrum using spectral projection.


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