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.
Highlights
volatile organic compounds (VOCs) belong to a broad family of organic compounds characterized by different functional groups, including various aromatic chloro hydrocarbons and perfluorocarbons, such as organic solvent thinners, degreasers, cleaners, lubricants, inflammable liquids [1,2,3,4]
terahertz time-domain spectroscopy (THz-TDS) spectroscopy has the advantages over traditional Fourier transform infrared spectroscopy (FTIR): it is insensitive to the thermal background, showing a higher signal-to-noise ratio (SNR) and does not require the using of cooling
We address the application of THz-TDS spectroscopy by investigating four different VOCs: benzene, styrene, toluene, and p-xylene, in their liquid phase
Summary
VOCs belong to a broad family of organic compounds characterized by different functional groups, including various aromatic chloro hydrocarbons and perfluorocarbons, such as organic solvent thinners, degreasers, cleaners, lubricants, inflammable liquids [1,2,3,4]. The photon energy of THz wave coincides with energy levels corresponding to low-frequency motions, such as the vibration, rotation and translation modes of molecules in their condensed phases, and intermolecular vibrations such as hydrogen bonds. With these properties, THz-TDS spectroscopy is a promising technique for the characterization of different solid and liquid materials in a wide range of research fields [19,20,21,22,23]. The technique is capable of evaluating the optical properties, the refractive index in addition to absorption coefficient, without using the Kramers-Kronig relations [24]
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