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  • 1
    Electronic Resource
    Electronic Resource
    Effect of crystallites on surface potential variations of Au and graphite (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 783-785 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surfaces made of the nonreactive materials Au and graphite exhibit low surface potential variations after a low-temperature ultrahigh vacuum bake. The variations (due to the finite size crystallites of these materials) may be reduced to a minimum by using Au surfaces of grain size less than 10 nm and graphite surfaces with highly aligned c-axis orientation. Procedures where this may be accomplished are described. Application to the Los Alamos antiproton gravity experiment is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351358
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Macroscopic variations of surface potentials of conductors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7126-7129 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface potential variations of the following conductors have been measured over a 0.7 cm2 area: bronze, NiP, conducting polymer (polyaniline), Al, Cu, Au, and graphite. The measurements were performed with a Kelvin probe of spatial and potential resolution of 1.5 mm and 1 mV, respectively. Subjecting the surfaces to no cleaning procedure other than a low temperature ultrahigh vacuum bake, we find a wide spectrum of variation in surface potential uniformity, with alloys typically the least uniform and nonreactive surfaces such as gold and graphite the most uniform (no fluctuations above the 1 mV probe sensitivity). Application of these results to the Los Alamos antiproton gravity experiment is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347601
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Coulomb interaction on time of flight of cold antiprotons launched from an ion trap (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 854-857 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Time-of-flight spectra for Maxwell–Boltzman (MB) distributions of antiprotons initially held in an ion trap and detected after being launched through a 50-cm-long shielding drift tube have been calculated. The distributions used are of temperature 0.4–40 K, cubic length 0.003–3.0 cm, and number 10–100 particles. The mutual Coulomb repulsion of the particles causes a reduction in the number of late arrival particles expected from the MB velocity distribution. The Coulomb energy is not equally divided among the particles during the expansion. The energy is transferred preferentially to the outer particles so that the reduction in the number of slow particles is not necessarily large. The reduction factor is found to be greater than unity when the potential energy of the trapped ions is greater than ∼5% of the ions' kinetic energy and is ∼2 for the launch parameters of the Los Alamos antiproton gravity experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144132
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Use of fullerene films as surfaces of uniform electric potential (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 455-457 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Continuous fullerene films (85% C60, 15% C70) of thickness ∼10 nm have been sublimed on a metallic substrate previously coated with a 1-nm-thick Ge sublayer. The films show no surface potential variations when scanned with a Kelvin probe of 1 mV and 1 mm potential and spatial resolutions. Transmission electron microscopy reveals the fullerene films to be amorphous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110022
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  • 5
    Electronic Resource
    Electronic Resource
    Beyond metric gravity: Progress on PS-200 (1993)
    Springer
    Hyperfine interactions 81 (1993), S. 87-96 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reconciliation of quantum mechanics and gravity on varying distance scales requires changes to General Relativity that may have testable implications. We briefly review the status of tests with matter of the inverse square law and the principle of equivalence, then report on progress on the drift-tube measurement section of PS-200, the experiment to measure the gravitational acceleration of antiprotons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567252
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    Paper (German National Licenses)
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