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  • 1995-1999  (5)
  • 1985-1989  (5)
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  • 1
    Digitale Medien
    Digitale Medien
    Trapping of ion-implanted deuterium in molybdenum (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3499-3507 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Trapping of ion-implanted deuterium (D) by irradiation defects and He bubbles in Mo was investigated through nuclear-reaction profiling of the D during linear ramping of temperature. Resulting data were analyzed using transport theory to obtain trap strengths. Nanometer-size He bubbles were found to trap the D with a binding enthalpy of 1.15±0.15 eV relative to the solution site, consistent with two independent predictions based, respectively, on effective-medium theory and thermodynamic analysis. Implantation damage trapped the D with three different binding enthalpies, 1.15, 1.03, and 0.80 eV, attributed, respectively, to vacancy clusters, monovacancies with low D occupancy, and monovacancies with high D occupancy. The two latter values are in good agreement with effective-medium theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337601
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  • 2
    Digitale Medien
    Digitale Medien
    Multiple hydrogen occupancy of vacancies in Fe (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1788-1794 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The binding of multiple deuterium (D) atoms to vacancies in iron (Fe) is investigated both experimentally, by use of ion-beam techniques, and theoretically, by use of the effective-medium scheme. The experimental D-release stages are accounted for by trapping at vacancies with a binding enthalpy that depends on occupancy. It is found that for 1–2 D in a vacancy, the trap strength is 0.63 eV, whereas the binding enthalpy for 3–6 D in a vacancy is 0.43 eV. These results are in good agreement with predictions from the effective-medium theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338020
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  • 3
    Digitale Medien
    Digitale Medien
    Compact, high-stability, "thimble-size'' scanning tunneling microscope (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1035-1038 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A new high-stability scanning tunneling microscope (STM) has been developed. Its key design feature is the application of two, concentrically aligned, piezoelectric ceramic tubes, allowing x–y–z motion of the tungsten tip as well as sample mounting to be cast into a single compact unit. The construction is small, very rigid, and temperature compensated, yielding reduced sensitivity to mechanical and acoustic vibrations and temperature variations. Other advantages of this "thimble-size'' STM include easy sample mounting and, at a later stage, operation under UHV conditions with access to other surface-analysis (UHV) tools. At present, the microscope is operated in air, and its performance is tested by imaging a highly oriented pyrolytic graphite surface and a Si(111) surface on which a 100-A(ring)-thick Au layer has been deposited.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139775
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  • 4
    Digitale Medien
    Digitale Medien
    Immobilization mechanisms for ion-implanted deuterium in aluminum (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1841-1850 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Aluminum was ion implanted with deuterium (D) and then subjected to linear temperature ramping, and the resulting D redistributions were monitored using the ion-induced nuclear reaction D(3He, p)4He. Data from such experiments were analyzed in terms of various immobilization processes, utilizing numerical solutions of the appropriate diffusion formalism. The identification of mechanisms was augmented by transmission electron microscopy. Irradiation defects believed to be of vacancy type were shown to trap the D with a binding enthalpy of 0.52±0.10 eV relative to solution sites, in excellent agreement with calculations based on effective medium theory. Stronger binding at the surface oxide was quantitatively described by assuming the formation of D2 molecules at the metal-oxide interface. At higher implanted concentrations the immobilization of D by precipitation of D2 bubbles was observed, and the subsequent release from these bubbles at more elevated temperatures was described by diffusion theory. Small, high-pressure He bubbles formed by ion implantation of He did not trap the D more strongly than the irradiation defects, in contrast to observations in a number of other metals, but consistent with predictions of effective medium theory for Al.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336037
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  • 5
    Digitale Medien
    Digitale Medien
    Calibration of the electrical response of piezoelectric elements at low voltage using laser interferometry (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2530-2531 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A laser interferometric method is described by which the length-to-voltage sensitivity of piezoelectric elements, as used e.g., in scanning tunneling microscopes, can be calibrated. The method is based on measuring the optical frequency of a laser locked to a piezoelectrically tuned interferometer, relative to a stable reference. The high sensitivity of this technique allows the calibration to be carried out in the low-voltage regime.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101064
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  • 6
    Digitale Medien
    Digitale Medien
    The reaction of carbon dioxide with an oxygen precovered Ag(110) surface (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9825-9831 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The reaction of CO2 with an oxygen precovered Ag(110) surface leading to the formation of carbonate has been studied by scanning tunneling microscopy (STM) for different oxygen precoverages. For coverages below 0.5 monolayers (ML), the reaction is initiated preferentially at steps and defects and spreads uniaxially along the [001] directed, added -Ag–O- rows. For initial oxygen coverages below 0.25 ML, complete transformation to the carbonate structure is observed. For higher initial oxygen coverage, the unreacted rows are compressed to a (2×1) structure. In all cases, the ratio of carbonate ions formed to oxygen atoms consumed from added rows is close to 1:2. The reaction leads to a new reconstruction of the surface in which the carbonate ions are seen to reside preferentially on top of [11¯0] directed triplet structures. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.469949
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  • 7
    Digitale Medien
    Digitale Medien
    Enhancement of surface self-diffusion of platinum atoms by adsorbed hydrogen (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 398 (1999), S. 134-136 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Surface diffusion of atoms is an important phenomenon in areas of materials processing such as thin-film growth and sintering. Self-diffusion (that is, diffusion of the atoms of which the surface is comprised) has been much studied on clean metal and semiconductor surfaces,. But in most cases ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/18185
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  • 8
    Digitale Medien
    Digitale Medien
    Comparative study of methods for measuring. the apparent barrier height on an atomic scale (1998)
    Springer
    Applied physics 66 (1998), S. S157 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 61.16.Ch; 85.30.Hi
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390051121
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  • 9
    Digitale Medien
    Digitale Medien
    Designing surface alloys with specific active sites (1996)
    Springer
    Catalysis letters 40 (1996), S. 131-135 
    Details
    ISSN: 1572-879X
    Schlagwort(e): active sites ; surface alloys ; STM ; molecular beams ; activation barriers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract This report describes a combined experimental and theoretical approach to the problem of designing surface alloys with specific chemical properties. Au-Ni(111) surface alloys were prepared and the distribution of active sites was determined by atomically resolved STM as a function of Au coverage. Using density functional theory the difference in activation energy for methane over the various sites was determined. The activity of the surface could be predicted directly by combining this information with the distribution of sites. Subsequent measurements of the activity proved this method to be quantitative and demonstrated that surface alloys with specific activity can be synthesized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00815272
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  • 10
    Digitale Medien
    Digitale Medien
    Stability of two-dimensional nanostructures (1999)
    Springer
    Applied physics 69 (1999), S. 559-569 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 61.16.Ch; 68.60.Dv; 82.30.Nr
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract. We investigate atomic and molecular nanostructures on metal surfaces by variable low-temperature scanning tunnelling microscopy. In combination with molecular dynamics calculations we achieve a detailed understanding of the stability of these structures.¶Atomic nanostructures in homoepitaxial metallic systems are thermodynamically only metastable. Two-dimensional islands on Ag(110) decay above a threshold temperature of T l=175 K. Caused by the anisotropy of the surface, distinct decay behaviours exist above and below a critical temperature of T c=220 K. Calculations based on effective medium potentials of the underlying rate limiting atomic processes allow us to identify the one-dimensional decay below T c as well as the two-dimensional decay above T c.¶In contrast to atoms, the intermolecular electrostatic interaction of polar molecules leads to thermodynamically stable structures. On the reconstructed Au(111) surface, the pseudo-chiral 1-nitronaphthalin forms two-dimensional supermolecular clusters consisting predominantly of ten molecules. Comparison of images with submolecular resolution to local density calculations elucidates the thermodynamical stability as well as the internal structure of the decamers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390051472
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