Efficient "on-the-fly" calculation of Raman spectra from ab-initio molecular dynamics: Application to
Pouya Partovi-Azar1, Thomas D Kühne2,3
1Department of Chemistry, Dynamics of Condensed Matter, Warburger Str. 100, Paderborn, D-33098, Germany.
Abstract:
We present a novel computational method to accurately calculate Raman spectra from first principles. Together with an extension of the second-generation Car-Parrinello method of Kühne et al. (Phys. Rev. Lett. 2007, 98, 066401) to propagate maximally localized Wannier functions together with the nuclei, a speed-up of one order of magnitude can be observed. This scheme thus allows to routinely calculate finite-temperature Raman spectra "on-the-fly" by means of ab-initio molecular dynamics simulations. To demonstrate the predictive power of this approach we investigate the effect of hydrophobic and hydrophilic solutes in water solution on the infrared and Raman spectra.
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