Zhang, Tianyao, Zhaohi Zhang, and Mark Arnold. "EXPRESS: Polarizability of Aspirin at Terahertz Frequencies Using Terahertz Time Domain Spectroscopy (THz-TDS)." Applied Spectroscopy (2018): 0003702818815177.
A novel application of terahertz time-domain spectroscopy (THz-TDS) is described for the determination of permittivity and polarizability of organic crystals, as exemplified by measurements with the polymorph I form of crystalline aspirin (acetylsalicylic acid). The coherent nature of the THz pulse experiment, coupled with gated-detection, permits direct measure of differences in the phase angle of the electric field vector after passing through a pellet composed of the aspirin crystals embedded within an inert polymer matrix. An effective …
For full paper see https://journals.sagepub.com/doi/10.1177/0003702818815177
… Relevant crystal structure information for this aspirin polymorph is listed in Table II. TheTHz spectra were collected by using a TeraView TPS Spectra 1000D THz time- domain spectrometer (TeraView Limited, Cambridge, UK). Details of the instrument can be..
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