There is a fundamental difference between the dielectric spectra of crystalline systems as well as amorphous and liquid systems in the THz range. Here we discuss recent theoretical progress on the calculation of the lowest vibrational modes in crystalline compounds. With density-functional perturbation theory it is possible to simulate, in a quantitative manner, the THz vibrational spectrum of hydrogen-bonded molecular crystals. In contrast to crystalline systems, aqueous systems have a featureless dielectric spectrum in the low-THz range. We will show that it is possible to use reflection THz spectroscopy to measure the alcohol concentration in aqueous solutions in a manner that is independent of the contents of other ingredients such as sugar, yeast, and organic particles.
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Jepsen, P.U., Merbold, H., Li, Z., **ng, X., Clark, S. (2007). Terahertz Time-Domain Spectroscopy of Crystalline and Aqueous Systems. In: Miles, R.E., Zhang, XC., Eisele, H., Krotkus, A. (eds) Terahertz Frequency Detection and Identification of Materials and Objects. NATO Science for Peace and Security Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6503-3_11
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DOI: https://doi.org/10.1007/978-1-4020-6503-3_11
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-6502-6
Online ISBN: 978-1-4020-6503-3
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