Stoppa, Alexander and Nazet, Andreas and Buchner, Richard and Thoman, Andreas and Walther, Markus (2015) Dielectric response and collective dynamics of acetonitrile. JOURNAL OF MOLECULAR LIQUIDS, 212. pp. 963-968. ISSN 0167-7322, 1873-3166
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Dielectric spectra in the frequency range of 0.1 <= nu/GHz <= 89 were recorded for acetonitrile, covering temperatures between 5 and 65 degrees C. These data are accurately described by a single Debye equation. The obtained values for static relative permittivity, relaxation amplitude and relaxation time exhibit a smooth temperature dependence with low standard uncertainties. Thus, acetonitrile may serve as a dielectric reference for medium permittivities (epsilon approximate to 30 - 40). At 25 degrees C the dielectric spectrum was extended to 8 THz. Its analysis revealed that the short-time dynamics of acetonitrile is dominated by dipole librarian and cage rattling. On the picosecond timescale these localized motions fade into rotational diffusion of the AN molecules, which is close to slip boundary conditions. Whilst static dipole-dipole correlations are present to some extent, dynamical correlations appear to be absent for diffusive dipole reorientation. (C) 2015 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INFRARED OPTICAL-CONSTANTS; LIQUID ACETONITRILE; ELECTROLYTE-SOLUTIONS; POLARIZABILITY RESPONSE; RELAXATION SPECTROSCOPY; CARBON-TETRACHLORIDE; MOLECULAR-DYNAMICS; WATER MIXTURES; CHLOROFORM; MODEL; Dielectric relaxation; Terahertz spectroscopy; Collective dynamics; Dipolar liquids; Dielectric reference |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 May 2019 13:26 |
| Last Modified: | 03 May 2019 13:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/4355 |
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