Gebauer, Denis

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Monitoring the crystallization of tartaric acid with THz spectroscopy

2017-08, Soltani, Amin, Gebauer, Denis, Fischer, Bernd M., Cölfen, Helmut, Koch, Martin

We study the crystallization of L-(+)-Tartaric acid by employing attenuated total reflection THz time-domain spectroscopy (TDS). In the so-called nucleation stage, the absorption spectrum shows a broadband transient increase. Besides, we observed a transient resonance at 750 GHz. This peak can be assigned to aggregation of L-(+)-Tartaric acid molecules including hydrated water molecules. Furthermore, the THz data reveal the vibration of clusters in the solution phase which is confirmed by analytical ultracentrifugation technique.