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Updated: Dec 29, 2025

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Characterization of volatile organic compounds (VOCs) in their liquid-phase by terahertz time-domain spectroscopy
Annalisa D'Arco1, Marta Di Fabrizio2, Valerio Dolci3
1INFN - Section of Rome 'La Sapienza', P.le Aldo Moro 2, 00185 Rome, Italy.
Abstract:
In this work the terahertz spectra of benzene, toluene, p-xylene and styrene-four volatile organic compounds (VOCs) of interest in environmental pollution studies-have been measured in their liquid phase at room temperature using terahertz time-domain spectroscopy (THz-TDS). Their frequency-dependent refractive index and absorption coefficient have been extracted and analyzed in the spectral range from 0.2 to 2.5 THz. The optical properties of bi-component VOCs mixtures have also been investigated and described in terms of a linear combination of pure VOCs optical components.
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