Boson Peak And Fracton Of Polymethyl Methacrylate Detected By Terahertz Time-Domain And Low-Frequency Raman Spectroscopies

Poster (CHEMBIO-P1)

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Terahertz time-domain spectroscopy and low-frequency raman scattering were performed on polymethyl methacrylate to detect the boson peak (BP) and fracton, which are universal excitations of glass. In infrared spectrum, BP is observed in the ()/^2 plot, where () is absorption coefficient.
Log-log plot of,() /^2, “() and the vibrational density of states show linear
frequency dependence above the BP frequency, where “() is the imaginary part of Raman susceptibility. We determined the infrared light vibration coupling constant CIR() and Raman coupling constant CRaman() to investigate how the fractal dimension and the fracton dimension appear in CIR() and CRaman().

Download Abstract: 20200825-nakagawa-irmmw-thz2020_abstract-rev-fin.pdf

Presenters and Authors Info

Presenter: Anonymous

Authors: Nakagawa, Shin; Mori, Tatsuya; Fujii, Yasuhiro; Kitani, Suguru; Koreeda, Akitoshi; Kawaji, Hitoshi; Ko, Jae-Hyeon; Kojima, Seiji

Department of Physical Sciences, Ritsumeikan University, Department of Physics, Hallym University, Division of Materials Science, University of Tsukuba, Laboratory for Materials and Structures, Tokyo Institute of Technology