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Koike, Masato; Imazono, Takashi; Nagano, Tetsuya*; Koeda, Masaru*; Sasai, Hiroyuki*; Oue, Yuki*; Yonezawa, Zeno*; Kuramoto, Satoshi*; Terauchi, Masami*; Takahashi, Hideyuki*; et al.
no journal, ,
Knowledge of the state density of a combination electron directing the properties of material is provided by soft X-ray emission spectrum. Particularly, boron (B-K: 183.3 eV) is key material as a trace element in steel materials, and there is a strong demand for a very small amount of born measurement from the industry. In this study, we designed new laminar-type diffraction gratings and performed theoretical evaluation. The surface is over-coated by a carbon layer on the surface of the conventional Au coated grating. As the base grating a grating of groove density of 1200 lines/mm, groove depth of 16nm, duty ratio of 0.3, and Au coating of 30 nm are assumed. The incidence angle and spectral order are 87.0
and +1, respectively. A grating coated with C on the base grating shows approximately 1.4-2 times higher diffraction efficiency comparing with the base grating at 183.3 eV.
Imazono, Takashi; Koike, Masato; Kawachi, Tetsuya; Hasegawa, Noboru; Koeda, Masaru*; Nagano, Tetsuya*; Sasai, Hiroyuki*; Oue, Yuki*; Yonezawa, Zeno*; Kuramoto, Satoshi*; et al.
no journal, ,
For study of the electronic structure of materials including rechargeable lithium ion batteries and solar cells by means of soft X-ray emission spectroscopy based on electron microscopes (EMs), an objective flat-field grating spectrograph is designed to have an expanded detection range of 50-4000 eV with high resolution compared to commercially available wavelength or energy dispersive X-ray spectrometer. We have divided the energy range into four ranges, i.e., (1) 50-200 eV, (2) 155-350 eV, (3) 300-2200 eV, and (4) 2000-4000 eV, and designed the dedicated laminar holographic varied-line-spacing gratings for the respective ranges. All gratings can be accommodated by a single retractable spectrograph. Therefore, the energy range can be easily selected by exchanging the gratings. Furthermore, especially for the range of (4), a grating coated with a newly invented wide band multilayer is developed to cover the whole energy range at a constant angle of incidence.
Kado, Masataka; Kishimoto, Maki; Tamotsu, Satoshi*; Yasuda, Keiko*; Aoyama, Masato*; Shinohara, Kunio*
no journal, ,
Laser plasma soft X-ray microscope, which is a combination of a laser plasma soft X-ray source and a contact type soft X-ray microscope, has been developed. Since the laser plasma soft X-ray sources have advantages of high brightness and short pulse duration, they can avoid radiation damage and motion blur affect on the images during acquisition of the soft X-ray images of live biological specimens. Hybrid microscopy, which was combination of a soft X-ray microscope and a fluorescence microscope, enabled the soft X-ray microscopy to identify cellular organelles precisely. Observing the Leydig cells, a single mitochondrion in the live biological cell was imaged for the first time and detailed structure of it was obtained.