Vibrational Spectroscopy in Molecular Dynamics Systems

Vibrational spectroscopy encompasses a suite of techniques that probe the quantised vibrations of molecular bonds, offering detailed insight into chemical structure, intermolecular interactions and dynamic processes. When integrated with molecular dynamics simulations, which trace the time‐resolved motions of atoms and molecules, vibrational spectra can be predicted with enhanced realism by accounting for anharmonicity, conformational flexibility and solvent effects. Infrared (IR) absorption, Raman scattering and vibrational circular dichroism (VCD) each report on distinct aspects of molecular behaviour: IR and Raman reveal mode‐specific bond polarisation and scattering events, while VCD sensitively detects chiral environments. By generating ensembles of molecular geometries through molecular dynamics, it becomes possible to compute time‐correlation functions of dipole and polarisation tensors, thereby capturing temperature‐dependent line shapes, band broadening and complex coupling phenomena. This synergy has broadened applications from characterising the solvation shells of biomolecules to unraveling reaction pathways in condensed‐phase systems, and has paved the way for predictive studies of pharmaceuticals, materials and stereochemical assignments.

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Vibrational Spectroscopy in Molecular Dynamics Systems publication trend

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Technical terms

Vibrational spectroscopy: Experimental methods, including IR, Raman and VCD, that measure vibrational transitions of molecular bonds.

Molecular dynamics simulations: Computational techniques that propagate atomic motions over time to sample conformational and solvation ensembles.

Vibrational circular dichroism (VCD): A chiroptical technique measuring the differential absorption of left and right circularly polarised infrared light by chiral molecules.

Time‐correlation function: A statistical measure of how molecular properties, such as dipole moment or polarizability, evolve over time, used to derive spectral intensities via Fourier transforms.

Atomic Polar Tensor (APT): A tensor quantifying the change in the molecular dipole moment with respect to atomic displacements, essential for IR intensity calculations.

Atomic Axial Tensor (AAT): A tensor relating changes in the molecular magnetic dipole to nuclear motions, critical for determining VCD intensities.

References

1. Predicting Vibrational Spectroscopy for Flexible Molecules and Molecules with Non‐Idle Environments. Advanced Theory and Simulations (2020).
2. Solvent Effects and Aggregation Phenomena Studied by Vibrational Optical Activity and Molecular Dynamics: The Case of Pantolactone. The Journal of Physical Chemistry B (2020).
3. Vibrational Circular Dichroism from DFT Molecular Dynamics: The AWV Method. Journal of Chemical Theory and Computation (2022).