| Research Abstract |
Mossbauer spectroscopy observes recoilless resonant absorption of ganma-ray by nucleus, and it is posiible to determine the details of the nuclear energy level with an ultra-high energy resolution like a lO^<-9> eV in the case of ^<57>Fe nucleus. Therefore, it is possible to examine the details of the hyperfine interactions between nucleus and atomic electron system, which is 10^<-7> eV order. From the hyperfine interaction parameters, the Mossbaue spectroscopy can offer the detailes of the electron system of materials microscopically. Especially, the local magnetism in materials is possible to elucidate from the hyperfine magnetic field and the informations through the hyperfine interactions obtained from Mossbauer spectroscopy have offered the physical and chemical properties of so-called high-Tc oxides superconductor, quasi-cristalline materials, artificial multilayers and nano-meter sized metallic particles. Furthermore, the ganma-ray phase change due to the refractive index of the transmitter placed between ganma-ray source and absorber can be measured from the small frequenchy shifts when the phase change depends on the time, because of its ultra-high energy (frequency) resolution. In this case, both of source and absorber nuclei degenerates. However, the nucleus non-degenerated by magnetic dipole interaction can emitted the polarized ganma-ray depending on the direction of the magnetic field and the propagation direction. Using this polarized ganma-ray, it is posiible to measure the magneto-optic effect in wavelength range of ganma-ray. In this investigation, the phase modulation Mossbauer spectroscopy, spectroscopy using a polarized ganma-ray and the nuclear resonant scattering with linearly polarized synchrotron radiation have been developed.
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