Simplified Ab Initio Molecular Dynamics-Based Raman Spectral Simulations. Issue 11 (November 2020)

• Record Type: Journal Article
• Authors: Aprà, Edoardo; Bhattarai, Ashish; Baxter, Eric; Wang, ShanYi; Johnson, Grant E.; Govind, Niranjan; El-Khoury, Patrick Z.
• Is Part Of: Applied spectroscopy. Volume 74:Issue 11(2020)
• Page Start: 1350
• Page End: 1357
• Publication Date: 2020-11
• Subjects: Raman spectroscopy -- ab initio molecular dynamics -- coupled perturbed Hartree–Fock -- independent particle approximation; Spectrum analysis -- Periodicals; 543.505
• DOI: 10.1177/0003702820923392
• Languages: English
• ISSNs: 0003-7028

Abstract

We describe a simplified approach to simulating Raman spectra from ab initio molecular dynamics (AIMD) calculations. The protocol relies on on-the-fly calculations of approximate molecular polarizabilities using the well-known sum over orbitals (as opposed to states) method. This approach bypasses the more accurate but computationally expensive approach to calculating molecular polarizabilities along AIMD trajectories, i.e., solving the coupled perturbed Hartree–Fock/Kohn–Sham equations. We demonstrate the advantages and limitations of our method through a few case studies targeting molecular systems of interest to surface- and/or tip-enhanced Raman spectroscopy practitioners.