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Coal tar is a complex mixture of a large number of polycyclic aromatic hydrocarbons (PAHs) and heterocyclic compounds. The terahertz (THz) spectral properties of coal tar are studied by terahertz time-domain spectroscopy (THz-TDS). The absorption coefficient, refractive index, and relative permittivity of coal tar in the range of 0.2–2.5 THz are determined. Compared with pure cyclic hydrocarbons such...