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We derive a general two-vector-embedded ro-vibrational kinetic energy operator (KEO) for a molecule with N atoms. Our KEO is valid for any molecule-fixed axis system attached to the two embedding vectors and any vibrational coordinates for the two-vector part of the KEO. It can be used to build up KEOs for larger molecules from KEOs for smaller molecules.
Wang et al. (Wed,) studied this question.
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