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1,165 results on '"Soda K"'

140. The relation between X-ray intensity and ion energy of laser triggered ion acceleration

Author

Takano, K., Nayuki, T., Oishi, Y., Fujii, T., Takizawa, Y., Nemoto, K., Soda, K., Takashima, R., Hasegawa, S., Horioka, K., Hotta, E., Takano, K., Nayuki, T., Oishi, Y., Fujii, T., Takizawa, Y., Nemoto, K., Soda, K., Takashima, R., Hasegawa, S., Horioka, K., and Hotta, E.

Abstract

When an ultrashort and intense laser pulse is irradiated onto a target, generation of energetic ions and energetic X-ray has strong relations because electrons generate both ions and X-rays. In this work, we measured the relation between X-ray intensity and the ion energy. The temperature of X-ray was measure to be 300-350 keV when the laser intensity was 3.3$\,\times\,$1018W/cm2. The maximum proton energy was 1.65$\,\pm\,$0.25 MeV for the laser energy of 200 mJ at the optimum target position where X-ray intensity was maximum.

Published
2006
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141. Atomic structure of an Al–Co–Ni decagonal quasicrystalline surface

Author

Yuhara, J., Klikovits, J., Schmid, M., Varga, P., Yokoyama, Y., Shishido, T., and Soda, K.

Abstract

We have analyzed the structure and composition of the first layer of an Al_72Co_16Ni_12 tenfold surface by means of scanning tunneling microscopy (STM), ion scattering spectroscopy (ISS), and Auger electron spectroscopy (AES). High-resolution STM images reveal local structures that have decagonal symmetry in addition to the usual pentagonal symmetry of the surface. This quasicrystal surface resembles a random tiling instead of an ideal quasiperiodic tiling. After annealing at 1100 K, the total surface atomic density found by ISS is (9±1d)*10^14 cm^{−2}. The surface densities of Al and TM (transition metal, i.e., Co and Ni) are determined as (8±1)*10^14 cm^{−2} and (1.0±0.2)*10^14 cm{−2}, respectively from ISS, indicating a similar density of Al and much lower density of the TM atoms in the surface layer than in a truncated bulk. The Al surface atomic density agrees well with the number of corrugation maxima in the STM images. A model of the arrangement of the Al atoms in the top layer is presented. Scanning unneling spectroscopy (STS) is performed to study the local electronic structure. The STS spectrum at the corrugation maxima is similar to that at the corrugation minima. A few ≃0.12 nm high protrusions in the STM images are attributed to local oxide clusters due to their STS spectra different from the corrugation ma ima and through in situ STM observations during exposure to O_2 gas at 2*10^{−6} Pa at RT.

Published
2004

142. In-situ RBS Studies on Dissolution of Pb Atoms from the SiO2 Surface into Water Solutions.

Author

Morita, K., Yuhara, J., Ishigami, R., Tsuchiya, B., Ishikawa, D., Soda, K., Saitoh, K., Ohnuki, T., Yamamoto, S., Aoki, Y., Narumi, K., and Naramoto, H.

Subjects
LEAD, SILICA, SOLUBILIZATION, BACKSCATTERING
Abstract

An in-situ RBS system has been developed to study the dissolution of Pb layers deposited physically on the SiO2 surface of Si(100) crystal into water solutions with different pH values. It is found that Pb atoms are not dissolved into alkaline water, but into acid water, and that the dissolution in the latter case is the zero-th order reaction kinetics and the rate constant is 0.67×1013 atoms cm-2s-1, which corresponds to 1.04×10-11 mol. cm-2s-1. The dissolution mechanism is discussed based on the experimental results. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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150. Performance of a very high resolution soft x-ray beamline BL25SU with a twin-helical undulator at SPring-8

Author

Saitoh, Y., primary, Kimura, H., additional, Suzuki, Y., additional, Nakatani, T., additional, Matsushita, T., additional, Muro, T., additional, Miyahara, T., additional, Fujisawa, M., additional, Soda, K., additional, Ueda, S., additional, Harada, H., additional, Kotsugi, M., additional, Sekiyama, A., additional, and Suga, S., additional

Published
2000
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