Vacuum and Surface Science
Online ISSN : 2433-5843
Print ISSN : 2433-5835
Volume 63 , Issue 6
Special Feature : Transactions of the Annual Meeting on the Japan Society of Vacuum and Surface Science 2019[I]
Showing 1-12 articles out of 12 articles from the selected issue
Preface
Special Feature : Transactions of the Annual Meeting on the Japan Society of Vacuum and Surface Science 2019[I]
  • Shinjiro YAGYU, Michiko YOSHITAKE, Toyohiro CHIKYOW, Takahiro NAGATA
    Type: Regular article
    2020 Volume 63 Issue 6 Pages 270-276
    Published: June 10, 2020
    Released: June 10, 2020
    JOURNALS FREE ACCESS

    The prediction performance of the automatic threshold estimation of photoelectron yield spectroscopy using machine learning and least squares regression (fitting) was verified using 82 measured data. The correct answer rate was greater than 80% for machine learning and less than 50% for fitting, within an error range of ±0.3 eV with respect to the correct answer (the result of human spectrum analysis). To further improve the correct answer rate, it is necessary to change the energy range and energy step of the measured data because increase in the nonlinear intensity at the high-energy side of the spectrum is considered to affect the automatic estimation. The estimation did not change with changes in the energy step of the data. However, when the energy range in the data was changed, the estimation improved. If the threshold is expected to be less than 6.0 eV, the prediction is improved by using an energy range of 4.2–6.2 eV.

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  • Yasuyuki YOKOTA, Norihiko HAYAZAWA, Bo YANG, Emiko KAZUMA, Francesca C ...
    Type: Current Topics
    2020 Volume 63 Issue 6 Pages 277-282
    Published: June 10, 2020
    Released: June 10, 2020
    JOURNALS RESTRICTED ACCESS

    Microscopic studies on electrolyte solution / electrode interfaces provide the most fundamental information not only for understanding the electric double layer formed at the interfaces but also for designing sophisticated electrochemical (EC) devices. In this study, we developed tip-enhanced Raman spectroscopy (TERS), which is based on an electrochemical scanning tunneling microscope (EC-STM), and demonstrated electrochemical TERS (EC-TERS) measurements of benzenethiol monolayers on Au(111). A specially-designed cell enables us to carry out reproducible EC, EC-STM, and EC-TERS measurements, which indicates consistent results among these techniques for the oxidative desorption of the benzenethiol monolayers.

    Editor’s picks

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  • Taisei MOTOMURA, Tatsuo TABARU
    Type: Current Topics
    2020 Volume 63 Issue 6 Pages 283-288
    Published: June 10, 2020
    Released: June 10, 2020
    JOURNALS RESTRICTED ACCESS

    This paper describes the newly developed two magnetron sputtering cathodes with a magnetic mirror configuration for a low gas and power operation and an inward enlargement of the doughnut-shaped plasma discharge area. These cathodes were named Magnetic Mirror-type Magnetron Cathode (M3C). Those magnetic field profiles have a simple structure using two cylindrical permanent magnets placed behind the disk-shaped sputtering target. In the case of M3C ver.1 (M3C1), the magnetic mirror configuration near the target center and the target edges enables a low DC input power operation down to 5 W at 0.26 Pa (Ar). In the case of M3C ver.2 (M3C2), both a pinhole-centered magnet and a tilt of magnetization vector to the normal to the target surface play an important role for the inward enlargement of the plasma discharge area.

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  • Ryongsok CHANG, Evan Angelo Quimada MONDARTE, Elisa Margarita MENDOZA ...
    Type: Current Topics
    2020 Volume 63 Issue 6 Pages 289-293
    Published: June 10, 2020
    Released: June 10, 2020
    JOURNALS RESTRICTED ACCESS

    Biomolecules interact with their target molecules accurately in crowded conditions in cells or bodies with rarely making mistakes (non-specific binding). In this review, we discuss the mechanism underlying the accuracy in the molecular recognition of biomolecules, in particular, the suppression of non-specific interactions. Our surface force measurements revealed that water-mediated force critically governs the colloidal stability of Au nanoparticles covered with DNA molecules. The colloidal stability depended on the complementarity of the terminal base pairs. In the case of the peptide molecules, the SAMs of peptide that contains zwitterionic pairs of glutamic acids and lysines exhibited excellent anti-fouling properties, whereas the SAMs of peptide that possesses glutamic acids and arginines did not. We also found that interfacial water plays an essential role as a barrier preventing the approach of proteins and cells. From these findings, we are noticing that biomolecules smartly use their interfacial water to accomplish their specific interactions.

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  • Yusuke SAKUDA, Shunsuke ASAHINA, Kenichi TSUTSUMI, Hiroshi ONODERA
    Type: Current Topics
    2020 Volume 63 Issue 6 Pages 294-297
    Published: June 10, 2020
    Released: June 10, 2020
    JOURNALS RESTRICTED ACCESS

    Recently it has become possible for SEM to obtain a backscattered electron image (BEI) at low incident voltages of 1 kV or less. However, it was reported that some brightness in the BEI acquired at low incident voltages was not always proportional to the average atomic number of the sample. In this study, we investigated contrast reversal phenomena of two elements (C and Au) in BEIs using backscattered electrons acquired by Auger electron spectroscopy (AES) at an incident voltage of about 1 kV.

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Current Topic
Review
  • Hajime YOSHIDA, Yoshinori TAKEI, Kenta ARAI
    Type: Review
    2020 Volume 63 Issue 6 Pages 304-310
    Published: June 10, 2020
    Released: June 10, 2020
    JOURNALS RESTRICTED ACCESS

    The characteristics of the gas flow changes depending on the diameter and the length of the cylindrical tube, pressure, gas spices, and temperature. There are at least six flow regimes to explain the characteristics of the gas flow, such as molecular flow (also called free molecular flow) ; continuum flow including viscous laminar flow, turbulent flow, critical flow (sonic flow or choked flow), and subcritical flow (subsonic flow or non-choked flow) ; and their intermediates (intermediate flow, transition flow, or slip flow). This review paper summarized equations to calculate the gas flow rate through a cylindrical tube for each flow regime.

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