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Okazaki, Japan

Yasue T.,Osaka Electro-Communication University | Suzuki M.,Osaka Electro-Communication University | Tsuno K.,Tokyo Electron | Goto S.,Tokyo Electron | And 2 more authors.
Review of Scientific Instruments | Year: 2014

Spin polarized electron beam is often used in material characterizations which relates to magnetism as well as in the high energy particle physics. The manipulation of the spin polarization toward the arbitrary direction is indispensable in such studies. In the present work, a novel multipole Wien filter is proposed as the three-dimensional spin manipulator, and a prototype 8-pole Wien filter is developed. It is applied to spin polarized low energy electron microscopy, and the variation of the magnetic contrast with managing the spin polarization is evaluated. It is confirmed that the novel multipole Wien filter can manipulate the spin polarization three-dimensionally. © 2014 AIP Publishing LLC. Source


Nishikawa K.,University of Tokyo | Kataoka M.,Institutes for Natural science | Nagata R.,Institutes for Natural science | Kitayama A.,Terabase Inc. | And 3 more authors.
14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010 | Year: 2010

This paper reports a novel method to chemically modify specific nucleotides in a stretched double-stranded DNA, and to label the modified nucleotides with fluoresceinated antibodies in order to visualize them using both fluorescence microscope and AFM. We show that the modification is possible even with 48.5 kb DNA stretched to the full length and immobilized on a solid surface, where the bases are forming closed pairs and the interaction with the surface can cause steric hindrance to chemical reactions. This method is expected to be used not only for a high-resolution microscope-based direct DNA sequencing, but also for a method to align molecules and nano-particles using DNA as a template. Source


Inayoshi Y.,Tokyo University of Agriculture and Technology | Minoda H.,Tokyo University of Agriculture and Technology | Minoda H.,Japan Science and Technology Agency | Arai Y.,Terabase Inc. | And 2 more authors.
Micron | Year: 2012

We have been developing a combination method for environmental TEM (E-TEM) and phase-plate TEM (P-TEM) that enables direct observations of the structure of biological molecules in aqueous solution. It is clearly demonstrated that the biological molecules in a water layer can be imaged by the combined method without any stain. The spatial resolution obtained in the present study was about 10. nm. This should be improved by using energy filtering. The image contrast of the specimen in water was reduced in comparison with that in vacuum. A model calculation that includes the effects of beam broadening, intensity decrease, and background increase caused by scattering from the water layer around the specimen shows that an increase in the thickness of the water layer reduces the contrast, intensity, and resolution of the image. © 2012 Elsevier Ltd. Source


Kimoto T.,Japan National Institute of Materials Science | Arai Y.,Terabase Inc. | Ren X.,Japan National Institute of Materials Science
Applied Surface Science | Year: 2013

Cs3Sb photocathodes were fabricated at 8-16 C with sandwiched layers of Sb, Cs, and Sb deposited onto the fine tips of three cathodes at 15 C. After examining the influence of the cathode tip temperature on the changes in the quantum efficiencies of the Cs3Sb photocathodes during and after additional Cs depositions, we performed lifetime tests of the three Cs 3Sb photocathodes using a 405-nm semiconductor laser and 488-nm Ar ion laser. The decrease in the photocurrent with time was more rapid with the 488-nm laser irradiation than with the 405-nm laser irradiation, and continuous laser irradiation caused a much more rapid decrease in photoelectrons with time than intermittent laser irradiation did. We deposited a 0.32-0.64-nm-thick W film or a 0.43-nm-thick Cr film onto the Cs3Sb photocathode during the lifetime test at 0.9-1.0 × 10-7 Pa. We found that the passive WO3 or Cr2O3 film, which was formed at a reduced vacuum level of 1.6 × 10-7 Pa or during the continuous 405-nm laser irradiation, increased the lifetime of the Cs 3Sb photocathode by effectively protecting its surface against oxidation and evaporation of Cs. This protection effect was most effective at approximately 90 C. © 2013 Elsevier B.V. All rights reserved. Source


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Terabase Corporation | Date: 2007-11-20

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