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Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 45, Issue 6
Displaying 1-11 of 11 articles from this issue
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  • Study of Adsorption, Desorption, and Reaction at Surface Using Molecular Beams
    Isao KUSUNOKI, Tsuyoshi TAKAOKA
    2002 Volume 45 Issue 6 Pages 489-497
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.489
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  • CH4 Dissociative Chemisorption Processes on Cesiated and Bare Pt (111) Surfaces
    Takahiro KONDO, Takashi SASAKI, Shigehiko YAMAMOTO
    2002 Volume 45 Issue 6 Pages 498-502
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.498
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    We have clarified the reaction processes of the CH4 dissociative chemisorption on cesiated and bare Pt (111) surfaces by means of a thermal energy He atom scattering technique. The amount of the reaction products has been found to be dependent on the incident kinetic energy of CH4, the work function of the surface and the energy loss during inelastic collisions. The reaction suppressed by Cs adsorption is attributed mainly to the increase in the activation barrier height for CH4 dissociation. This enhanced barrier height is caused by the decrease in the work function as a result of cesiation.
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  • Local Tunneling Barrier Height Measurements
    Yoichi YAMADA, Asawin SINSARP, Masahiro SASAKI, Shigehiko YAMAMOTO
    2002 Volume 45 Issue 6 Pages 503-507
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.503
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    The local tunneling barrier height (LBH) measurements of two cases, monolayer graphite (MG) on Pt (111) and Cs/ Si (111) 7 × 7, are discussed. In the LBH measurements on MG/Pt (111), the distribution of microscopic work function was observed, which is due to inhomogeneous inter-layer interactions. From the LBH imaging of Cs/Si (111) 7 × 7 Cs adsorption structure can be classified into three types. The LBH reduction upon Cs adsorption is found only at the Cs adsorption sites. The increase in the density of states (DOS) around the Cs adsorption sites are also observed. This is rather long-ranged effect of Cs adsorption.
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  • Environmental Safety Issues for Semiconductors
    Research for Scarce Materials Recycling from Waste of GaAs Film
    Shigekazu IZUMI
    2002 Volume 45 Issue 6 Pages 508-513
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.508
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  • Nerve Cell Attachment Property of Absorbable Poly-Lactic-Acid Modified by Carbon Negative-Ion Implantation
    Masayoshi IZUKAWA, Hiroshi TSUJI, Hiroko SATO, Hitoshi SASAKI, Yasuhit ...
    2002 Volume 45 Issue 6 Pages 514-518
    Published: June 20, 2002
    Released on J-STAGE: January 30, 2010
    DOIhttps://doi.org/10.3131/jvsj.45.514
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    We have investigated nerve cell-attachment properties of Poly-Lactic-Acid (PLA) surface modified by carbon negative-ion implantation. PLA is one of the absorbable polymers used in medical surgery. PLA sheets were implanted with carbon negative-ions at an energy in a range of 5-30 keV with dose in 1 × 1014-1 × 1016 ions/cm2. Contact angle for the PLA implanted at 5 keV showed a large value of 94° at a dose of 1 × 1014 ions/cm2, and then it decreased with an increase in dose to 80°. For the samples at 3 × 1015 ions/cm2, the contact angle slightly decreased from 82° to 78° as increasing in ion energy. In the nerve cell culture experiment with nerve cells of PC 12h cell (rat adrenal pheochromocytoma), selective cell attachment properties were obtained. The nerve cells attached on the unimplanted area in Carbon-implanted PLA samples at 5 and 10 keV, on the other hand, they attached on only implanted area for 30 keV C-implanted PLA sample.
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  • Long-term Stability of a High Precision Diaphragm Gauge
    Akihiko YONENAGA, Katsuhisa SAITOU, Tokihiko KOBATA, Masahiro HIRATA, ...
    2002 Volume 45 Issue 6 Pages 519-524
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.519
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    Precise diaphragm gauges with MEMS (MicroElectroMechanical Systems) sensors are widely used as reference for calibration of practical pressure gauges. To make the best use of their performances, techniques for appropriate measurement control are becoming to be more important.
    This paper describes calibration examples and measuring performance of diaphragm gauges with accuracy of 0.01% of full scale. Three diaphragm gauges with 130 kPa of full scale were calibrated in absolute mode against a pressure balance, which was the working standard of AIST, for three years. The expanded relative uncertainty was about 45 × 10-6 at 120 kPa. Careful control of calibration condition, such as zero point, stabilization time of indication etc. was a key to the precise calibration.
    The long-term stabilities of calibration over three years were within 2 Pa at 100 kPa, and no significant tendency was observed. The main components of uncertainties of measurements came from the uncertainties of reference pressure of the pressure balance, zero-pressure reading of diaphragm gauges, and hysterisis effect.
    Judging from these data, pressure measurements with expanded relative uncertainty of 64 × 10-6 at 120 kPa are feasible.
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  • Preparation of Reactive Magnetron Sputtered Zr-Al-N Films and Their Properties
    Takashi MATSUNAGA, Masaaki YOSHITAKE, Toshikazu NOSAKA, Akio OKAMOTO
    2002 Volume 45 Issue 6 Pages 525-527
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.525
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    Zr-Al-N films have been produced by using the RF magnetron sputtering process. Films sputtered reactively from a (Zr, Al) composite target have been deposited in various nitrogen flow. The film properties, such as atomic composition, electrical and optical properties as a function of nitrogen flow, are investigated. It is found that the film properties can be widely changed from metal to semiconductorlike by increasing nitrogen flow. The further researches are required such as structural analysis and the effect on the resistance against oxidation of Zr-Al-N films at high temperatures.
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  • Control of Optical Absorption Band due to Cu/Ag Nanoparticles in SiO2 Glass by Dual Ion Implantation of Cu- and Ag-
    Hiroshi TSUJI, Ken'ichi KURITA, Masanori MOTONO, Hiromitsu SUGAHARA, Y ...
    2002 Volume 45 Issue 6 Pages 528-532
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.528
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    Optical absorption properties of Cu and Ag double metal negative-ion-implanted silica glasses have been investigated from a standpoint of controlling absorption band due to surface plasmon resonance of nanoparticles. Three silica glasses were implanted with Cu negative ions at 30, 60 and 90 keV, respectively, with dose of 1 × 1017 ions/cm2. Then, Ag negative ions were implanted into each sample at a constant condition of 40 keV and 5 × 1016 ions/cm2.Optical absorption spectra were measured after annealing at various temperatures for 1 hour in Ar gas flow. In all samples annealed at 500 °C and below, intense and wide absorption with a peak of 2.6-2.8 eV was observed, and the peak position was moved to higher energy with increase in annealing temperature. These absorption peaks were considered to be due to Cu-Ag alloy nanoparticles. After annealing at 600-800°C, a sharp and intense absorption peak was observed for all the samples at photon energy of 3.1 eV, of which the absorption corresponded to that due to surface plasmon resonance of pure silver nanoparticles.
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  • Mechanical Properties and Outgassing Rate Measurement Of Titanium Hydro-Formed Bellows
    Yoshiki TAKAHASHI, Kosei HIGUCHI, Motosada KANEKO, Kenzaburo SUGISAKI, ...
    2002 Volume 45 Issue 6 Pages 533-536
    Published: June 20, 2002
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.3131/jvsj.45.533
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    Mechanical and vacuum properties of titanium hydro-formed bellows have been experimentally investigated, such as mechanical life, spring constant, and out-gassing rate. Annealing improves the endurance of titanium bellows three to five times. The titanium bellows has modest flexibility and small hysterisis, which spring constant is 30% smaller than that of the conventional SUS316L bellows. The out-gassing rate is less than that of the SUS316L bellows in spite of baking.
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  • Molecular Flux Density Distribution on the Wall of a Test Dome for Measuring the Speed of a Vacuum Pump
    Namio MATUDA
    2002 Volume 45 Issue 6 Pages 537-540
    Published: June 20, 2002
    Released on J-STAGE: January 30, 2010
    DOIhttps://doi.org/10.3131/jvsj.45.537
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    A new solution has been obtained on the distribution of the moleclular flux density striking the wall of a test dome for measuring the speed of a high vacuum pump. The calculation was carried out based on sloving Clausing's integral equations by using iterative approximation method. It is found that the exact position of the wall of the tube where flux denisty shows the same value as exhaust end of the tube (≅0.5D, where D is tube diameter) is little affected by the gas inlet position nor the angular distribtion of inlet gas.
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  • [title in Japanese]
    [in Japanese]
    2002 Volume 45 Issue 6 Pages 541-544
    Published: June 20, 2002
    Released on J-STAGE: January 30, 2010
    DOIhttps://doi.org/10.3131/jvsj.45.541
    JOURNAL FREE ACCESS
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