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Harmonic vibrational analysis in delocalized internal coordinates

Jensen, Frank and Palmer, David S. (2011) Harmonic vibrational analysis in delocalized internal coordinates. Journal of Chemical Theory and Computation, 7 (1). pp. 223-230.

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Abstract

It is shown that a principal component analysis of a large set of internal coordinates can be used to define a nonredundant set of delocalized internal coordinates suitable for the calculation of harmonic vibrational normal modes. The selection of internal coordinates and the principal component analysis provide large degrees of freedom in extracting a nonredundant set of coordinates, and thus influence how the vibrational normal modes are described. It is shown that long-range coordinates may be especially suitable for describing low-frequency global deformation modes in proteins.