Journal of Computational Chemistry· 2026Q1
Simulating Infrared Spectra of Matrix Isolation Experiments: What Works Best?
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- Q1SCImago
- 2026year
Short summary
Gas-phase anharmonic or scaled harmonic frequency calculations are the most accurate and efficient methods for simulating matrix isolation spectra of H2S·amine complexes, outperforming ab initio molecular dynamics (AIMD) and conventional DFT harmonic/anharmonic calculations.
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Key points
- Ab initio molecular dynamics (AIMD) did not offer superior frequency accuracy compared to conventional harmonic DFT for matrix-isolated H2S·amine complexes.
- Explicitly modeling the argon matrix in simulations did not improve the accuracy of vibrational frequencies.
- Gas-phase anharmonic frequency calculations provide accurate spectral simulations.
- Scaled harmonic frequency calculations at an appropriate theory level are also effective and efficient.
- Computational cost favors gas-phase anharmonic or scaled harmonic methods over AIMD for this application.
AI-generated from the title and abstract; the full text is not read.
Abstract
ABSTRACT Matrix isolation is an experimental technique which allows spectroscopists to observe highly reactive or weakly bound systems by trapping them in frozen noble gas matrices. In this work, we studied the viability of using ab initio molecular dynamics (AIMD) to simulate several H 2 S·amine complexes isolated in solid argon crystals, comparing the results with conventional density functional theory (DFT) harmonic and anharmonic calculations to assess the most practical and accurate method to calculate the vibrational spectrum of such systems. While AIMD accurately predicted the intensity ratios of certain peaks, the frequencies themselves were no more accurate than conventional harmonic DFT calculations. Modeling an explicit argon matrix did not improve the results. Based on the computational cost of each method, a gas phase anharmonic or scaled harmonic frequency calculation at an appropriate level of theory was determined to be the most accurate and efficient way to simulate matrix isolation spectra.
The authors' abstract, as published at the source. Journal of Computational Chemistry, 2026 · DOI ↗
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Field: Physical and Theoretical Chemistry
Physical and Theoretical ChemistryChemistry