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24 citations found for Nishino,

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A new experimental technique for reciprocal X-ray holography has been developed. The experimental set-up makes it possible to measure a reciprocal hologram without unwanted mixture of the X-ray fluorescence holography signal.



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An imaging soft X-ray microscope with zone plates has been installed at Rits SR Center (Ritsumeikan University, Kusatsu, Japan). With this microscope, specimens were set in air, which made it possible to investigate the specimens without breaking the vacuum of the microscope. The specimens can be prefocused with an optical microscope. Dry and wet biospecimens in air were observed. A new optical system was designed to improve the resolution.

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Vasohibin-1 and small vasohibin-binding protein (SVBP) form an intermolecular heterotetramer in the crystal. The heterotetramer was stabilized by exchange of the conserved N-terminal region.

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Three crystals of MHF and its complex with FANCM were obtained, and structural analysis revealed not only their structures but the unexpected release of FANCM from MHF. The biochemical stability of the FANCM–MHF complex was analyzed and it was found that an oxidative environment and organic solvent promote the aggregation and dissociation of the complex.

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Apodized X-ray illumination generated by a two-stage deformable Kirkpatrick–Baez mirror system was employed to improve the image quality in scanning X-ray fluorescence microscopy. It is also demonstrated that the apodized X-ray illumination enables non-isolated objects to be imaged by coherent X-ray diffractive imaging in a non-scanning mode.

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Bonsu is an open-source software package primarily for the reconstruction of phase information from coherent X-ray diffraction measurements.

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The theory of photon interference X-ray absorption fine structure ([pi]XAFS) is described. Due to coherent X-ray scattering from atoms, a spatial variation of the X-ray intensity is produced inside the sample. The intensity at the X-ray absorbing atom changes according to the incident energy. Thus [pi]XAFS in extended absorption spectra is produced. It extends in a wide energy range over absorption edges. For powders the [pi]XAFS formula has equivalent form as the EXAFS formula, and the Fourier transform provides distances of neighboring atoms from the absorbing atom. Due to a long mean free path of the photon, [pi]XAFS for powders contains sharp structures. They are explained as a crystal grain orientation averaging of the X-ray standing wave effect.



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Acta Cryst. (2002). A58, c306
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We have measured magnetic circular dichroism (MCD) spectra at the transition-metal L2,3 edges in D03-type (Fe1-xMnx)3Al in order to investigate their local magnetic moments. The analysis of the spectra shows that Fe has moments much larger than Mn, whose moment is ferromagnetically coupled with the Fe one. This does not lend support to the antiferromagnetic mechanism proposed for the reduction in magnetization as well as a large Mn moment predicted for x = 1/3. The evolution of satellites found in the Mn spectrum with x increased suggests that the change in the electronic state may result in the magnetization reduction.

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The present high-resolution photoelectron study of Heusler-type Fe2VAl confirms the predicted density of states, in particular, the existence of a pseudogap at EF in its bulk electronic structure, which may cause its semiconductor-like conductivity behaviour at high temperatures, and suggests its electronic structure is highly sensitive to the local structural modification.

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An X-ray BBB interferometer has shown intensity oscillations when its front mirror was displaced by a piezoelectric disc translator. These were caused by the change in the length of the front path while that of the back path stayed constant.

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Bragg backscattering of 10 keV X-rays from large commercial quartz crystals has shown low defect concentrations and experimental energy widths of 4.0 meV. Quartz thus appears to be a useful X-ray optical material, particularly for meV-resolution energy analyzers of X-rays with energy 12 keV or less.


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