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  • Articles: DFG German National Licenses  (20)
  • 1995-1999  (1)
  • 1985-1989  (19)
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  • Articles: DFG German National Licenses  (20)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Study of two-body and three-body channels for the reaction of metastable helium atoms with selected atomic and molecular species (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3061-3071 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This work reports the measurements of rate coefficients for excitation transfer reactions of metastable He(2 3S) atoms, produced in 0.3–4 atm of helium, with various reactants presenting a wide range of characteristics. In all cases studied, three-body reaction channels were identified with most probable values of rate coefficients lying in the range from 0.2 to 6.7×10−31 cm6 s−1, for Ne and N2O, respectively. These are generally more than one order of magnitude smaller than previously reported. The interpretation of this discrepancy in terms of a more reactive intermediate He2(Σ*) complex in dynamic equilibrium with the He(2 3S) population seems to be confirmed, and is analyzed in some detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453949
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Laser plasma source of amorphic diamond (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 216-218 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphic diamond films characterized by a high percentage of sp3 bonds have been prepared in an UHV environment with a laser plasma source of carbon ions. Peak power densities in excess of 1011 W/cm2 were found necessary to produce films at growth rates of 0.5 μm/h over areas of 20 cm2 having optical quality sufficient to show bright interference colors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101013
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Diamond-like carbon films prepared with a laser ion source (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 187-188 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diamond-like carbon films have been deposited onto clean, unseeded substrates using a hybrid ion beam technique. In this method the ion fluences available for acceleration were particularly enhanced by the use of laser ablation plumes ejected from highly purified graphite targets. The combination of levels of purity characteristic of ultrahigh vacuum environments, large ratios of ion to neutral concentrations, and high fluences showed considerable merit for the growth of large-area (10 cm2 ) films of optical quality and uniformity at deposition rates approaching 20 μm/h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100169
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Frequency-modulation spectrometer for Mössbauer studies (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 362-367 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A nuclear frequency-modulation spectrometer (NFMS) for high-resolution gamma-ray spectroscopy is described in this article. As the name implies, this device operates by modulating the cross section for gamma-ray absorption. The automation of this spectrometer required the development of an interface to an Apple computer which provides a real-time data display. This interface also enables the Apple computer to control up to two Mössbauer spectrometers at once, with a real-time data display for each. A nuclear frequency-modulation spectrometer makes it possible to observe directly the phenomenon known as "rf sidebands'' in Mössbauer spectroscopy, without interference from the "parent transitions.'' The high resolution of NFMS makes it possible to examine the "rf sidebands'' for any fine structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140205
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Calibration of pulsed x-ray spectra (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 414-419 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new technique has recently been described for the absolute calibration of intense sources of pulsed radiation in the 0.2–1-MeV range of photon energies. An x-ray activation technique, it depended upon the storage of samples of the irradiating spectrum in the form of populations of nuclei excited to isomeric states with lifetimes of seconds to hours. Accuracy was dependent upon the precision assumed for tabulated values of nuclear parameters. Described here is an extension of this technique to the larger range of photon energies, 0.2–1.5 MeV and to intensities from 1012 keV/keV to 1016 keV/keV using the target nuclei 79Br and 77Se. In this work self-consistency of the nuclear parameters was directly determined. Important changes were found to be necessary for improved accuracy, particularly over the larger ranges of experimental variables being considered. Values of the now-consistent set of nuclear parameters are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140219
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Flash x-ray source excited by stacked Blumlein generators (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2260-2264 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Eight triaxial Blumleins have been stacked in series at one end while being synchronously commuted at the other end with a single hydrogen thyratron. Significant voltage gain has been maintained in the stack for periods of the order of 20 ns. Having no other switching elements, operation has been possible at repetition rates to 100 Hz. An x-ray diode has been matched to this pulse power source, making possible the emission of an average bremsstrahlung dose of 5.8 R/s from a sequence of 20-ns pulses. In less than 4 min of operation at 100 Hz, a dose of 1 kR could have been delivered to a target sample. When operated at 50-kV charging voltage, spectral measurements show the output to be a true continuum, peaking at intensities in excess of 2×108 keV/keV/shot and containing useful intensities of photons having energies of 150 keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139944
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Scaling to high average powers of a flash x-ray source producing nanosecond pulses (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 2103-2109 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Described here is the scaling of a repetitively pulsed, flash x-ray source to yield 140-mW average power in 15-ns pulses of radiation near 1 A(ring). Interchangeability of discharge anodes has provided for a significant fraction of the output to be extracted in the K lines of Cu, Mo, Nb, and Ag. In less than 1 min of experimental time, a peak spectral density is radiated that exceeds 1×1018 keV/keV. For some applications this device can offer a tabletop alternative to laser plasma x rays and to synchrotron radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139471
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Calibration of pulsed bremsstrahlung spectra with photonuclear reactions of 77Se and 79Br (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 2157-2160 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method is reported for calibrating bremsstrahlung spectra in the 200–1000-keV range with x-ray activation techniques. This approach is particularly significant for pulsed sources that cannot be characterized with conventional spectroscopy methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139661
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Flash x-ray source of intense nanosecond pulses produced at high repetition rates (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 863-865 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Described here is a repetitively pulsed, flash x-ray source capable of emitting 35-mW average power in 6-ns pulses of radiation near 1.5 A. From this device a significant fraction of the output is represented by the K lines of copper, so that in less than 1 min of experimental time a peak spectral density is radiated that exceeds 2×1017 keV/keV. For some applications this device can offer a laboratory alternative to laser plasma x rays or synchrotron radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138826
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Mössbauer isomer shift measurements without mechanical tuning (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3258-3261 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique is described which demonstrates how a frequency modulation spectrometer (FMS) can be used to measure the isomer shift of ferromagnetic absorbers without mechanical tuning. As an example, the isomer shift of an iron sample relative to a 57Co source in a Pd matrix was measured and found to be −(0.1869±0.003) mm/s compared to the literature value of −(0.185±0.02) mm/s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141077
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    Paper (German National Licenses)
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