Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 117, Issue 14, Pages 6489-6492Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1506156
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Research papers and textbooks addressing the problem of internal rotation in a molecule explain symmetry properties of the torsional potential by local geometrical symmetries of the molecule. It is shown here that symmetry properties of a torsional potential derive from permutation inversion symmetry and a peculiar nature of torsional dynamics but have no relation to actual geometrical symmetries. To confirm the validity of our symmetry analysis a minimum energy torsional potential curve has been determined ab initio for acetaldehyde, resulting in exact 2pi/3 periodicity that no previous ab initio calculations achieved. (C) 2002 American Institute of Physics.
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