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Terahertz Time-Domain Spectroscopy and Low-Frequency Raman Scattering of Crystalline and Glassy Pharmaceutical Indapamide

Kobayashi Y., Shibata T., Mori T., Kojima S.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 46

16--22

We performed terahertz time-domain spectroscopy and low-frequency Raman scattering on crystalline and glassy states of pharmaceutical indapamide (IND). We have determined the real and imaginary part of the complex dielectric constants and the imaginary part of the Raman susceptibility in the THz region. Several phonon peaks have been observed in the crystalline IND and the mutual exclusion principle of infrared and Raman spectroscopy holds in the measured frequency range. In a glassy state of IND, a broad absorption peak has been observed in both the THz and the Raman spectra with different spectral shape, and this disagreement indicates that the far-infrared and Raman lightvibration coupling constants are different in the glassy IND. A clear boson peak has been observed in the Raman spectra of the glassy IND at about 0.5 THz.

Study of thermal disordering of the KSc(WO4)2 crystal structure by Raman spectroscopy

Mączka M., Hanuza J., Sidorov N., Kojima S.

Materials Science

2002

Vol. 20, No. 1

105-110

Raman spectra of KSc(WO4)2, exhibiting three reversible phase transitions from a trigonal phase to monoclinic and triclinic structures, have been studied in the temperature region of 100-294 K. The mea surements have revealed the presence of significant broadening of librational and translational modes of the ??24 WO ions with increasing temperature. This broadening was explained as a result of anisotropic activation of the complex ion reorientations.