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  • 1990-1994  (3)
  • 1975-1979  (1)
  • 1993  (3)
  • 1977  (1)
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  • 1990-1994  (3)
  • 1975-1979  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Fragmentation processes in reactive molecular ion beam etching (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7517-7520 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a reactive ion beam etching system, gas phase collision processes in the reaction chamber were identified from the energy distributions of positive ions originating from source plasmas with O2, SF6, and CF4 as feed gases. The ion energy distributions are determined by a quadrupole mass spectrometer for main beam energies below 500 eV at typical working pressures in the reaction chamber of 1–10×10−2 Pa. Besides near thermal ions a considerable amount of high energy fragmentation products were detected for a number of primary molecular ions. The relative intensities of these products compared to the parent ions suggest a non-negligible influence of gas phase dissociation processes on the etch or deposition characteristics of molecular ion beams and the resulting properties of surfaces treated under elevated working pressure conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354977
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Antiidiotype (Ab2) Vaccine Therapy for Cutaneous T-Cell Lymphoma (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 690 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb44036.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Positron lifetimes and annihilation lineshape in Cd and au from 4.2 K to the melting points (1977)
    Springer
    Applied physics 12 (1977), S. 59-67 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract By means of an integrated source-specimen technique the temperature dependence of positron lifetimes and annihilation lineshapes has been measured, on the same specimens of gold and cadmium from 4.2K to the melting points, and also in electronirradiated and quenched gold. The anomalous temperature dependence of positron annihilation at intermediate temperatures (200 to 350 K in Cd, 270 to 750 K in Au) discovered by Lichtenberger, Schulte, and MacKenzie is confirmed. The data are incompatible with the idea that the intermediate temperature dependence is due to thermal expansion. They are well explained by an extension of the trapping model which includes the formation of metastable self-trapped positrons. From lineshape measurements after electron irradiation at 180 K and after quenching it is deduced that the trapping rate of positrons at vacancy-type defects in Au is temperature independent below room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900069
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A combination of quasirelativistic pseudopotential and ligand field calculations for lanthanoid compounds (1993)
    Springer
    Theoretical chemistry accounts 85 (1993), S. 441-450 
    Details
    ISSN: 1432-2234
    Keywords: Lanthanoid elements ; Pseudopotentials ; Ligand field model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Improved energy-adjusted quasirelativistic pseudopotentials for lanthanoid atoms with fixed valency are presented and tested in molecular calculations for CeO, CeF, EuO, GdO, YbO, and YbF. The pseudopotential calculations treat the lanthanoid 4f shell as part of the core and yield accurate estimates for average bond lengths, vibrational frequencies and dissociation energies of all states belonging to a superconfiguration. Information for each individual state of the considered superconfiguration may be obtained from subsequent ligand field model calculations. The results of this combined pseudo-potential and ligand field approach (PPLFT) are compared to more accurate calculations with ab initio pseudopotentials that include the lanthanoid 4f orbitals explicitly in the valence shell and to available experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01112983
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    Paper (German National Licenses)
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