Thursday, July 24, 2014

New Findings on Molecular Structures from RIKEN Summarized (Separation of overlapping vibrational peaks in terahertz spectra using two-dimensional correlation spectroscopy)

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Molecular Structures. According to news reporting out of Miyagi, Japan, by NewsRx editors, research stated, "In this study, the terahertz (THz) absorption spectra of poly(3-hydroxybutyrate) (PHB) were measured during isothermal crystallization at 90-120 degrees C. The temporal changes in the absorption spectra were analyzed using two-dimensional correlation spectroscopy (2DCOS). In the asynchronous plot, cross peaks were observed around 2.4 THz, suggesting that two vibrational modes overlap in the raw spectrum."
Our news journalists obtained a quote from the research from RIKEN, "By comparing this to the peak at 2.9 THz corresponding to the stretching mode of the helical structure of PHB and the assignment obtained using polarization spectroscopy, we concluded that the high-frequency band could be attributed to the vibration of the helical structure and the low-frequency band to the vibration between the helical structures. The exact frequencies of the overlapping vibrational bands and their assignments provide a new means to inspect the thermal behavior of the intermolecular vibrational modes."
According to the news editors, the research concluded: "The large red-shift of the interhelix vibrational mode suggests a large anharmonicity in the vibrational potential."
For more information on this research see: Separation of overlapping vibrational peaks in terahertz spectra using two-dimensional correlation spectroscopy. Journal of Molecular Structure, 2014;1069():152-156.Journal of Molecular Structure can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Journal of Molecular Structure -
Our news journalists report that additional information may be obtained by contacting H. HoshinaRIKEN, Aoba Ku, Sendai, Miyagi 9800845, Japan. Additional authors for this research include S. Ishii and C. Otani (see also Molecular Structures).
Keywords for this news article include: Miyagi, JapanAsia, Molecular Structures
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