Semiclassical Molecular Dynamics for Condensed Phase NMR Spectroscopy

Q: What does this research mean for the field?

A semiclassical molecular dynamics method based on the Meyer-Miller formalism and Caldeira-Leggett model can simulate NMR spectral line shapes at long bath correlation times, predicting considerably broader line shapes than those predicted by Redfield theory. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Hampus Karlsson; Marco Cazzaniga; Michele Ceotto

doi:10.1021/acs.jctc.6c01206

September 11, 2026Journal of Chemical Theory and ComputationOpen Access

Semiclassical Molecular Dynamics for Condensed Phase NMR Spectroscopy

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Key Points

Investigate the impact of harmonic oscillator environments on NMR spectral line shapes in condensed-phase spin systems using a semiclassical framework that extends beyond standard relaxation theory limits.
Applied the Meyer–Miller mapping formalism and Caldeira–Leggett model with discretized spectral density to represent spin variables as classical coordinates coupled to harmonic bath oscillators.
Derived expressions for the motion of density matrix elements modulating observable NMR signals.
Simulated spectra for single-spin and two-spin I=1/2 systems at correlation times reaching and exceeding the validity threshold of Redfield theory.
Simulated NMR line shapes are considerably broader than line shapes predicted by conventional Redfield relaxation theory.
The semiclassical approach successfully simulates spectral dynamics at long bath correlation times where standard perturbative theories break down, capturing effects from nonsecular bath frequencies.

Implication

Simulation study reveals broader spectral line shapes than standard Redfield theory in condensed-phase spin systems, highlighting the role of extended bath correlation times.

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Cite This Study

Karlsson et al. (2026) studied this question.

synapsesocial.com/papers/6aa7b29f0926e14a848b1126 https://doi.org/10.1021/acs.jctc.6c01206

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Semiclassical Molecular Dynamics for Condensed Phase NMR Spectroscopy

Key Points

Implication

Abstract

Discussion

Cite This Study

Semiclassical Molecular Dynamics for Condensed Phase NMR Spectroscopy

Key Points

Implication

Abstract

Discussion

Cite This Study

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