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  • Articles  (3)
  • Articles: DFG German National Licenses  (3)
  • plasma diagnostics  (3)
  • 2020-2022
  • 1980-1984  (3)
  • 1925-1929
  • Technology  (3)
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  • Articles  (3)
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  • Articles: DFG German National Licenses  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Novel techniques for plasma diagnostics: Electron paramagnetic resonance and laser-induced fluorescence spectroscopy (1981)
    Springer
    Plasma chemistry and plasma processing 1 (1981), S. 3-18 
    Details
    ISSN: 1572-8986
    Keywords: “Cold” plasmas ; plasma diagnostics ; concentration of species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Diagnostic techniques for low-pressure, “cold” plasmas have mostly been limited to emission and mass spectrometry. Herein, the techniques of gas-phase electron paramagnetic resonance and laser-induced fluorescence spectroscopy are briefly reviewed. Particular attention is paid to their attributes which make them good candidates for plasma diagnostic tools. It is found that gas-phase electron paramagnetic resonance can be used to determine and monitor the absolute concentration of a number of important plasma species, e.g., free radicals and atoms. Laser-induced fluorescence can also monitor, with even more sensitivity, but perhaps not so well absolutely, the concentrations of many plasma species, e.g., free radicals, metastable excited states, and molecular ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566372
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diagnostics of microwave-induced plasmas and polymerization of gaseous hydrocarbons (1981)
    Springer
    Plasma chemistry and plasma processing 1 (1981), S. 377-395 
    Details
    ISSN: 1572-8986
    Keywords: Microwave plasma ; polymerization ; plasma diagnostics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The microwave plasmas of gaseous mixtures of methane-argon and propyleneargon were analyzed along the flow stream by the electrical double floating probe system, optical spectroscopy, and quadrupole mass spectrometry. The plasma variables measured and considered were current density, electric field strength, electron temperature, positive ion and electron concentrations, and concentration of pyrolyzed and polymerized species. The results indicate that an irreversible process of polymerization of the hydrocarbons takes place in the plasma. The polymerization process reaches its maximum conversion downstream beyond the microwave cavity. The extent of polymerization was correlated to the concentration of positive ions and electrons in the plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565994
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of velocity and surface temperature of alumina particles on the properties of plasma sprayed coatings (1982)
    Springer
    Plasma chemistry and plasma processing 2 (1982), S. 255-291 
    Details
    ISSN: 1572-8986
    Keywords: Plasma spraying process ; particle temperature and velocities ; plasma diagnostics ; alumina coatings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract In this paper are described the main characteristics of the plasma spraying process of alumina deposits, i.e., the temperature and flow field of the plasma jets obtained with the classical spraying torches, the injection of the particles into the plasma jet, the particle surface temperature and velocities in the plasma (measured for calibrated alumina particles), and the coating generation. The measurements on the alumina particles are compared with the predictions of a mathematical model. The experimental and computed particle velocities are in rather good agreement. However, this is not the case for the particle surface temperature. Possible reasons for the discrepancy are proposed (influence of the carrier gas, thermophoretic forces, and poor penetration of the particles into the plasma core even for an injection velocity twice that of the optimal calculated one, as shown by recent measurements). Finally the correlations between the particle velocities and surface temperature, and the properties of the alumina coating (porosity, crystal structure, mechanical properties) are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566524
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    Paper (German National Licenses)
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