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{\Large \bf Infrared Physics Group}\\

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Professor~(concurrent) &:&Takeshi~Hattori\\
Associate Professor~(concurrent) &:&Yukio~Shibata\\
Assistant Professor &:&Kimihiro~Ishi\\
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(http://www.rism.tohoku.ac.jp/irlab/index.html)\\
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\noindent
{\bf   1. Coherent radiation from microbunches of electrons}

    We have been studying coherent radiation emitted from microbunches
    of electrons of linear accelerators.  In the 
    millimeter and submillimeter wave region, pioneering observation 
    of the coherent radiation such as   
    synchrotron-, transition-, diffraction-, Smith-Purcell- and
    Cherenkov-radiation are made to elucidate their radiation 
    processes. By the use of the coherent
    radiation, we have constructed a free electron laser with 
    a broad-band spectrum  
    and have been investigating its characteristics. A novel technique
    to determine the distribution function of electrons in the
    microbunch is being developped on the basis of the properties 
    of the coherent radiation in frequency domain.

\noindent
{\bf   2. Low-energy dynamics in disordered materials}

    Disordered materials such as glasses and solid solutions exhibit dynamic
    properties different from crystalline solids, especially in
    low-energy region($\sim$10 meV). 
    The nature of the low-energy 
    states in disordered materials is a subject of current interest and
    controversy. In order to clarify the origin of the low-energy
    states we investigate quantitatively the frequency and temperature
    dependencies of absorption of glasses and ion-conductors by using a
    Fourier transform spectrometer in the far-infrared region. 

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