Information on the electronic structure of a molecule and its chemical bonds is encoded in the molecular normal vibrational modes. However, normal vibrational modes result from a coupling of local vibrational modes, which means that only the latter can provide detailed insight into bonding and other structural features. In this work, it is proven that the adiabatic internal coordinate vibrational modes of Konkoli and Cremer [Int. J. Quantum Chem. 67, 29 (1998)] https://doi.org/10.1002/(SICI)1097-461X(1998)67:1<29::AID-QUA3>3.0.CO;2-0 represent a unique set of local modes that is directly related to the normal vibrational modes. The missing link between these two sets of modes are the compliance constants of Decius, which turn out to be the reciprocals of the local mode force constants of Konkoli and Cremer. Using the compliance constants matrix, the local mode frequencies of any molecule can be converted into its normal mode frequencies with the help of an adiabatic connection scheme that defines the coupling of the local modes in terms of coupling frequencies and reveals how avoided crossings between the local modes lead to changes in the character of the normal modes.
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28 August 2012
Research Article|
August 31 2012
Relating normal vibrational modes to local vibrational modes with the help of an adiabatic connection scheme
Wenli Zou;
Wenli Zou
Department of Chemistry,
Southern Methodist University
, 3215 Daniel Ave, Dallas, Texas 75275-0314, USA
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Robert Kalescky;
Robert Kalescky
Department of Chemistry,
Southern Methodist University
, 3215 Daniel Ave, Dallas, Texas 75275-0314, USA
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Elfi Kraka;
Elfi Kraka
Department of Chemistry,
Southern Methodist University
, 3215 Daniel Ave, Dallas, Texas 75275-0314, USA
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Dieter Cremer
Dieter Cremer
Department of Chemistry,
Southern Methodist University
, 3215 Daniel Ave, Dallas, Texas 75275-0314, USA
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J. Chem. Phys. 137, 084114 (2012)
Article history
Received:
June 16 2012
Accepted:
August 07 2012
Citation
Wenli Zou, Robert Kalescky, Elfi Kraka, Dieter Cremer; Relating normal vibrational modes to local vibrational modes with the help of an adiabatic connection scheme. J. Chem. Phys. 28 August 2012; 137 (8): 084114. https://doi.org/10.1063/1.4747339
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