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Summary

We developed two Python codes, pyHRSOA and pyTHSOA, to simplify calculating the circular differential scattering ratio. These tools facilitate advanced nonlinear chiroptical techniques like hyper-Rayleigh scattering optical activity (HRS-OA) and third-harmonic scattering optical activity (THS-OA) spectroscopy.

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Area of Science:

  • Computational chemistry
  • Spectroscopy
  • Chiroptics

Background:

  • Nonlinear chiroptical techniques like hyper-Rayleigh scattering optical activity (HRS-OA) and third-harmonic scattering optical activity (THS-OA) rely on the circular differential scattering ratio.
  • Calculating this ratio involves complex molecular invariants and hyperpolarizabilities, complicating computational implementation.

Purpose of the Study:

  • To present pyHRSOA and pyTHSOA, user-friendly Python postprocessing codes.
  • To simplify the computation of the circular differential scattering ratio for HRS-OA and THS-OA spectroscopies.

Main Methods:

  • Developed two Python codes, pyHRSOA and pyTHSOA, as black-box tools.
  • Utilized DALTON quantum chemistry software for calculating hyperpolarizabilities from response functions.
  • Focused on simplifying the complex expressions for chiral and achiral contributions to scattered intensities.

Main Results:

  • Successfully created postprocessing codes that streamline the computation of the circular differential scattering ratio.
  • The codes handle the complexity of 30 (for HRS-OA) and 46 (for THS-OA) molecular invariants.
  • Provided accessible source code for researchers.

Conclusions:

  • pyHRSOA and pyTHSOA significantly ease the computational burden for HRS-OA and THS-OA spectroscopy.
  • These tools enable broader application of novel nonlinear chiroptical techniques.
  • Facilitated research in molecular chirality and optical properties.