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Terahertz (THz) absorption spectra of poly(3-hydroxyalkanotes) (PHA) were measured by a terahertz timedomain spectrometer and Fourier transform far-infrared spectrometer. Clear differences were observed between the spectra of crystalline and amorphous PHA, indicating that the absorption peaks observed in the THz spectra originated in the higher-order conformation of PHA. Direction of the vibrational...
Temperature-dependent absorption-spectra measurements in far-infrared of estrogenic pollutants at various temperatures using terahertz spectroscopy are presented. The shifting of absorption peaks with decreasing temperature is ascribed to the collective vibrational modes of the molecule.
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