Abstract
Well resolved far-infrared spectra of 1,4-benzoquinone, 1,4-naphthoquinone, and 9, 1 0-anthraquinonme in polycrystalline form have been measured with terahertz time domain spectroscopy at room temperature. The characterizations of power absorption and index of refraction in the frequency range 0.3 -2.0 THz are presented. Theoretical calculation is applied to assist the analysis and assignment of individual THz absorption spectra of the rho-quinones with semiempirical AM1, Hartree-Fock (HF), and density functional theory (DFT) method. Observed THz responses are assigned to the translational and torsional vibrations of rho-quinone dimer held together by weak hydrogen bonds.
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