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IBM Journal of Research and Development

Issue 4 • Date July 1986

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Displaying Results 1 - 12 of 12
  • Preface

    Publication Year: 1986, Page(s): 354
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (145 KB)

    Understanding the basic structure of matter and measuring this structure in detail have long presented a challenge to philosophers and scientists. In the fifth century B.C., the Greek philosopher Democritus described the ultimate structure of matter as discrete rather than continuous and is reported to have said that “The only existing things are atoms and empty space; all elsei s mere opin... View full abstract»

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  • Squeezable tunneling junctions

    Publication Year: 1986, Page(s):370 - 373
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (411 KB)

    Squeezable tunneling junctions establish the current state of the art for resistance stability of mechanically adjustable tunneling structures at ΔR/R ≈ 0.1%. This is sufficient for use in connection with spectroscopies as subtle as phonon spectroscopy, but it is marginal and cannot at present be maintained to high enough bias voltage to permit molecular vibrational spectroscopy. Squ... View full abstract»

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  • Electronic structure and tunneling current for chemisorbed atoms

    Publication Year: 1986, Page(s):374 - 379
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (517 KB)

    We discuss the tunneling current density in the vacuum region between two planar metal electrodes, one of which has an atom chemisorbed on its surface. The relation of this current distribution to the electronic structure of the adatom is analyzed. The study of this model problem leads to a better understanding of important aspects of the current flow in the scanning tunneling microscope. The emph... View full abstract»

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  • Application to biology and technology of the scanning tunneling microscope operated in air at ambient pressure

    Publication Year: 1986, Page(s):380 - 386
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (640 KB)

    We have investigated the operation of the scanning tunneling microscope (STM) in air at atmospheric pressure, thus permitting the imaging of samples without the need for subjecting them to a vacuum environment. Clearly, this may be of practical importance for many types of samples having biological and technological interest. Imaging of biological samples has been found to be possible after deposi... View full abstract»

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  • Tunneling microscopy from 300 to 4.2 K

    Publication Year: 1986, Page(s):387 - 395
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (816 KB)

    A scanning tunneling microscope (STM) has been developed for operation over the full temperature range from 300 to 4.2 K. At room temperature, the instrument has been used to produce topographic images of grain structure in a copper-titanium alloy foil and of atomic structure on a Pt(100) surface. At low temperatures, the instrument can be used in a new spectroscopic mode, one which combines the h... View full abstract»

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  • A scanning tunneling microscope for surface science studies

    Publication Year: 1986, Page(s):396 - 402
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (796 KB)

    A new design is described for a scanning tunneling microscope intended for surface science studies. The performance of the microscope is evaluated from tunneling images obtained of the Si(111) 7×7 surface. Periodic structures, point defects, and grain boundary structures are observed with atomic-scale resolution and are discussed. Illustrations of various types of image processing and data ... View full abstract»

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  • Defects on the Pt(100) surface and their influence on surface reactions—A scanning tunneling microscopy study

    Publication Year: 1986, Page(s):403 - 410
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (647 KB)

    Structural differences between a clean, reconstructed Pt(100) surface and one exhibiting chemical or structural irregularities have been identified by means of a scanning tunneling microscope. The (temperature-dependent) defect structure of a surface which had undergone a phase transition involving mass transport was characterized and compared to results obtained using other techniques. The cataly... View full abstract»

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  • Spectroscopy of electronic states of metals with a scanning tunneling microscope

    Publication Year: 1986, Page(s):411 - 416
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (547 KB)

    We have constructed a scanning tunneling microscope (STM) and have obtained current-voltage derivative spectra from metal surfaces. For Au(111) we have observed an electronic surface state 0.4 eV below the Fermi energy. This state has previously been observed with photoemission and oxide tunneling experiments. We have also observed strong peaks in spectra obtained from Pd(111) which we identify wi... View full abstract»

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  • Some design criteria in scanning tunneling microscopy

    Publication Year: 1986, Page(s):417 - 427
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (856 KB)

    Optimum functioning of a scanning tunneling microscope (STM) requires tip-to-sample position control with picometer precision, a rough and fine positioning capability in three dimensions, a scanning range of at least 100 times the lateral resolution, a scanning speed as high as possible, and also, preferably, simplicity of operation. These requirements have to be satisfied in the presence of build... View full abstract»

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  • Possible mechanisms of atom transfer in scanning tunneling microscopy

    Publication Year: 1986, Page(s):428 - 430
    Cited by:  Patents (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    Various mechanisms for the sudden transfer of an atom from or to the tip of a scanning tunneling microscope are considered. It is concluded that thermal desorption could be responsible and also that quasi-contact in which the adsorbed atom is in effect “touching” both surfaces, which would still be separated from each other by 2–4 Å, can lead to unactivated transfer via... View full abstract»

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  • Recent papers by IBM authors

    Publication Year: 1986, Page(s):431 - 437
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (561 KB)

    The information listed here is supplied by the Institute for Scientific Information. Reprints of the papers may be obtained by writing directly to thejirst author cited. Papers are listed alphabetically by author. View full abstract»

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  • Recent IBM patents

    Publication Year: 1986, Page(s):438 - 440
    IEEE is not the copyright holder of this material | PDF file iconPDF (200 KB)
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Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center