Anharmonic vibrational properties by a fully automated second-order perturbative approach

Area of Science:

• Computational Chemistry
• Quantum Mechanics
• Molecular Spectroscopy

Background:

• Accurate prediction of molecular properties is crucial for understanding chemical phenomena.
• Traditional methods for calculating anharmonic force constants are computationally intensive and complex.
• Vibrorotational parameters provide insights into molecular structure and dynamics.

Purpose of the Study:

• To develop and implement a fully automated computational code for anharmonic force constants.
• To utilize these constants for second-order perturbative evaluations of vibrorotational parameters.
• To assess the performance and limitations of different computational approaches.

Main Methods:

• Development of a novel, fully automated computational workflow.
• Calculation of anharmonic force constants using the developed code.
• Application of second-order perturbation theory for vibrorotational parameter prediction.
• Benchmarking against various computational levels and existing data.

Main Results:

• Successful implementation of an automated code for anharmonic force constants.
• Accurate prediction of vibrorotational parameters for test molecules.
• Identification of the strengths and weaknesses of different computational strategies.
• Demonstration of the code's efficiency and reliability.

Conclusions:

• The developed automated code offers an efficient and reliable method for calculating anharmonic force constants.
• This approach significantly aids in the accurate prediction of molecular vibrorotational parameters.
• The study provides valuable insights into the performance of various computational methods for these calculations.