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{\Large \bf Electron-Crystallography and -Spectroscopy Group}\\

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Professor &:&Masami~Terauchi\\
Associate Professor &:&Kenji~Tsuda\\
Assistant Professor &:&Koh~Saitoh\\
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(http://xes.tagen.tohoku.ac.jp/)\\
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%{\bf Research Activities}
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{\bf (a) Electron Crystallography (Electron-diffraction and -microscopy)}

Crystal symmetries, microscopic crystal structures, 
atom positions, Debye-Waller factors 
and bonding charge distribution are studied by 
convergent-beam electron diffraction (CBED) and electron microscopy 
using an energy-filter transmission electron microscope. 
These techniques are applied to 
phase transformations of ferroelectric substances, 
higher-dimensional structures of quasicrystals and incommensurate crystals, 
charge/orbital-ordering phenomena of strongly-correlated electron systems 
and lattice defects and interface structures of semiconductors. 

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{\bf (b) Electron Spectroscopy (EELS and SXES based on electron microscopy)}

Electronic structures of solids in nm-scale specimen area are studied by 
a high energy-resolution electron energy-loss spectroscopy (EELS) 
microscope and a newly developed soft-X-ray emission spectroscopy (SXES) 
microscope.  
These studies include a systematic investigation of carbon allotropes 
(C$_{60}$,C$_{70}$,....., carbon and boron-nitride nanotubes), boron 
allotropes (pure and metal-doped $\alpha$, $\beta$-boron and related 
boron compounds),  band structures of oxide superconductors (Bi-, 
La-systems), the metal-insulator transitions of transition metal oxides, 
pseudo-gap structures of quasicrystals, the defect levels of 
semiconductors and multi-layer materials and plasmons in metals and 
alloys. 

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