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Communications: Polarity fluctuations of the protic ionic liquid ethylammonium nitrate in the terahertz regime
Matthias Krüger1, Erik Bründermann, Stefan Funkner
1Department of Physical Chemistry 2, Faculty of Chemistry and Biochemistry, Ruhr-University of Bochum, D-44780 Bochum, Germany.
Abstract:
We have measured the complex dielectric function of the protic ionic liquid ethylammonium nitrate in the frequency range between 0.15 and 1.8 THz with a terahertz time domain spectrometer. The experiments reveal a terahertz mode which can be described as a damped harmonic oscillator with a central frequency of 1.3 THz. The terahertz mode is assigned to an intermolecular vibration, presumably associated with hydrogen-bond dynamics. The data are combined with microwave data to represent the dielectric spectrum from quasistatic conditions up to 1.8 THz.
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