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A revised formulation of the generalized subsystem vibrational analysis (GSVA).

Yunwen Tao1, Wenli Zou2, Sadisha Nanayakkara1

  • 1Department of Chemistry, Southern Methodist University, 3215 Daniel Ave, Dallas, TX 75275-0314 USA.

Theoretical Chemistry Accounts
|March 15, 2021
PubMed
Summary

A simplified generalized subsystem vibrational analysis (GSVA) method is presented, enabling intrinsic fragmental vibrations calculation without complex parameter definition. This revised approach (rev-GSVA) is applicable to various molecular structures and is available in the UniMoVib package.

Keywords:
GSVAHarmonic approximationNormal mode analysisSubsystemUniMoVibVibrational spectroscopy

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Quantum chemistry

Background:

  • Existing generalized subsystem vibrational analysis (GSVA) requires explicit definition of internal coordinate parameters.
  • This can be a complex and redundant process for subsystem analysis.

Purpose of the Study:

  • To present a simplified formulation of GSVA for intrinsic fragmental vibrations.
  • To develop a more accessible method for calculating vibrational properties of molecular subsystems.

Main Methods:

  • Introduced a revised GSVA (rev-GSVA) that bypasses explicit parameter definition.
  • Employs massless Eckart conditions and Gram-Schmidt orthogonalization.
  • Applied to both equilibrium and transition state structures.

Main Results:

  • The rev-GSVA successfully obtains intrinsic fragmental vibrations.
  • The method simplifies the computational process for subsystem analysis.
  • The implementation is integrated into the open-source UniMoVib package.

Conclusions:

  • The simplified GSVA offers a more efficient and user-friendly approach to calculating fragmental vibrations.
  • rev-GSVA expands the applicability of subsystem vibrational analysis.
  • The availability in UniMoVib promotes wider adoption in computational chemistry research.