An efficient and robust procedure to calculate absorption spectra of aqueous charged species applied to NO2−. Issue 27 (5th July 2021)

• Record Type: Journal Article
• Authors: Uribe, Lina; Gómez, Sara; Giovannini, Tommaso; Egidi, Franco; Restrepo, Albeiro
• Is Part Of: Physical chemistry chemical physics. Volume 23:Issue 27(2021)
• Page Start: 14857
• Page End: 14872
• Publication Date: 2021-07-05
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d1cp00652e
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Accurate calculation of absorption spectra of aqueous NO2 − requires rigorously sampling the quantum potential energy surfaces for microsolvation of NO2 − with at least five explicit water molecules and embedding the resulting clusters in a continuum solvent accounting for the statistical weighted contributions of individual isomers. Abstract : Accurate calculation of absorption spectra of aqueous NO2 − requires rigorously sampling the quantum potential energy surfaces for microsolvation of NO2 − with at least five explicit water molecules and embedding the resulting clusters in a continuum solvent accounting for the statistical weighted contributions of individual isomers. This method, which we address as ASCEC + PCM, introduces several desired features when compared against MD simulations derived QM/MM spectra: comparatively fewer explicit solvent molecules to be treated with expensive QM methods, the identification of equilibrium structures in the quantum PES to be used in further vibrational spectroscopy, and the unequivocal identification of cluster orbitals undergoing electronic transitions and charge transfer that originate the spectral bands.