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  • Electronic Resource  (5)
  • 1990-1994  (3)
  • 1975-1979  (1)
  • 1920-1924  (1)
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  • Electronic Resource  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Ion temperature measurements in tokamak plasmas by Rutherford scattering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3359-3368 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Rutherford scattering diagnostic has been applied at the TEXTOR tokamak to obtain spatially and temporally resolved information on the temperature of the bulk ions in the plasma. In the experimental setup, a helium atomic beam (30-keV, 12-mA equivalent current) passes vertically through the plasma core. A small part of the injected atoms is scattered elastically by the thermally moving plasma ions. The ion temperature in the scattering volume can be determined from the broadening of the energy spectrum of the scattered particles. Energy analysis of the scattered atoms is performed by a mass-selective time-of-flight analyzer detecting the particles at an observation angle which is selectable between 3° and 8°. Coincidence techniques have been successfully applied in this detector for rejection of background events triggered by detections of neutrons and gamma radiation. Ion temperature profiles were measured on a shot-to-shot basis by shifting the cross section of the diagnostic beam and the observational volume of the analyzer through the plasma. The ion temperatures measured in ohmic deuterium plasmas were found to be in reasonable agreement with those obtained from passive neutral particle analysis. Up to now, ion temperatures have been measured throughout the complete discharge with an accuracy of 8% and a time and space resolution of 100 ms and 0.10 m at a scattering angle of 7°. Deuteron density profiles could be deduced from the scattering yield measured at different radial positions in the plasma. The ratio of the isotopes, hydrogen and deuterium, was determined from their separate contributions to the spectrum of helium particles scattered on hydrogen and deuterium. Although theoretical predictions showed that the majority of the probing helium atoms loses one of its electrons during the elastic scattering process on multiply charged carbon and oxygen ions, contributions from impurities to the observed experimental spectrum are shown to appear dominant for impure plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142553
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gas chromatographic determination of ethylene in large air volumes at the fractional parts-per-billion level (1976)
    s.l. : American Chemical Society
    Analytical chemistry 48 (1976), S. 38-41 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60365a060
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Background correction in frequency modulated simultaneous atomic absorption spectrometry (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 346 (1993), S. 392-395 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary For a long time simultaneous multielement determination by AAS has been a subject of intensive research. In this work a simultaneous multielement atomic absorption spectrometry method is described in a special new arrangement, called frequency modulated simultaneous AAS (FremsAAS), using fiberoptics, interference filters and frequency modulation and demodulation by lock-in amplifiers as main devices. Purpose of this work was to equip the FremsAAS with a D2-background correction and to test it with certified reference materials. Mn, Cd, Pb, Cu, Ni, Cr and Zn had been determined simultaneously (three at a time) in sewage sludge (BCR/CRM 146), estuarine sediment (BCR/CRM 277) and phosphate rock (BCR/CRM 32) with good feasibility. Frequency modulated simultaneous AAS with background correction (FremsAASUK) represents an interesting alternative to known instruments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325849
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  • 4
    Electronic Resource
    Electronic Resource
    The Wickbold combustion method for the determination of mercury under statistical aspects (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 349 (1994), S. 502-509 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The combination of the Wickbold combustion apparatus with a mercury/hydride atomic absorption spectrometer for the routine determination of mercury is investigated. A flow injection system is used to introduce the solution from the decomposition into the spectrometer. The data obtained are treated by several statistical tests which have been recommended for quality control purposes. Simplicity of the statistical treatment is emphasized. The mercury content of certified reference materials is determined using the Wickbold combustion unit, and the resulting data are analyzed statistically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323982
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Literatur (1920)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 59 (1920), S. 16-17 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01361765
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    Paper (German National Licenses)
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