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A QM/MM and QM/QM/MM study of Kerr, Cotton–Mouton and Jones linear birefringences in liquid acetonitrile

Abstract

QM/MM and QM/QM/MM protocols are applied to the ab initio study of the three linear birefringences Kerr, Cotton–Mouton, and Jones, as shown by acetonitrile in the gas and pure liquid phases. The relevant first-order properties as well as linear, quadratic, and cubic frequency-dependent response functions were computed using time-dependent Kohn–Sham density-functional theory with use of the standard CAM-B3LYP functional. In the liquid phase, a series of room temperature (293.15 K) molecular dynamics snapshots were selected, for which averaged values of the observables were obtained at an optical wavelength of 632.8 nm. The birefringences were computed for electric and magnetic induction fields corresponding to the laboratory setup previously employed by Roth and Rikken in Phys. Rev. Lett. 85, 4478, (2000). Under these conditions, acetonitrile is shown to exhibit a weak Jones response — in fact roughly 6.5 times smaller than the limit of detection of the apparatus employed in the measurements mentioned above. A comparison is made with the corresponding gas-phase results and an assessment is made of the index of measureability, estimating the degree of overlap of the three birefringences in actual measurements. For acetonitrile, it is shown that this index is a factor of 3.6 and 6.7 larger than that of methylcyclopentadienyl-Mn-tricarbonyl and cyclohexadienyl-Fe-tricarbonyl, respectively — two compounds reported in Phys. Rev. Lett. 85, 4478, (2000) to exhibit a strong Jones signal.

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Publication details

The article was accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP07421B
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    A QM/MM and QM/QM/MM study of Kerr, Cotton–Mouton and Jones linear birefringences in liquid acetonitrile

    T. Fahleson, J. M. H. Olsen, P. Norman and A. Rizzo, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP07421B

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