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We developed WaveMixings.jl, a Julia package for efficient on-the-fly simulations of nonlinear spectroscopic signals using the quasi-classical doorway-window approximation. This tool aids in analyzing complex molecular dynamics and developing new simulation methodologies.

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Area of Science:

  • Computational Chemistry
  • Spectroscopy
  • Quantum Dynamics

Background:

  • Nonlinear time-resolved spectroscopy provides insights into ultrafast molecular dynamics.
  • Simulating these signals often requires computationally intensive methods.
  • The quasi-classical doorway-window approximation offers a balance between accuracy and efficiency.

Purpose of the Study:

  • To present an efficient numerical implementation of the quasi-classical doorway-window approximation.
  • To introduce the Julia package WaveMixings.jl for on-the-fly simulations of time-resolved nonlinear spectroscopic signals.
  • To provide a versatile platform for simulating and developing new methodologies within this framework.

Main Methods:

  • The WaveMixings.jl package utilizes quasi-classical trajectory data (electronic state energies and transition dipole moments).
  • It processes this data to generate spectral intensities as functions of frequency and pump-probe delay time.
  • The implementation explicitly includes laser pulse shapes and durations, differentiating it from other codes.

Main Results:

  • WaveMixings.jl efficiently simulates various nonlinear spectroscopic signals, including transient absorption and two-dimensional electronic spectra.
  • The package handles input/output, data filtering, and postprocessing.
  • It provides raw spectroscopic data for further analysis.

Conclusions:

  • WaveMixings.jl offers an efficient and versatile tool for simulating time-resolved nonlinear spectroscopy.
  • The inclusion of laser pulse characteristics enhances simulation accuracy.
  • This package facilitates research in ultrafast molecular dynamics and the development of novel simulation techniques.