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  • 1975-1979  (7)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Electron gas in molecular oxygen discharge (1977)
    Springer
    Czechoslovak journal of physics 27 (1977), S. 888-898 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusion In this paper numerical calculations of the electron energy distribution and some swarm parameters are presented on the basis of a numerical solution of Boltzmann equation with the cross-sections assumed to be given. The method requires that the set of the cross-section data be well known. The accuracy of all the results at moderate values ofE/N is then dependent only on the cross-sections whilst the calculations for high values ofE/N can be, furthermore, distorted by an inadequate approximation (1) which is otherwise commonly used for these purposes. In fact, it can be said that all our swarm parameter curves lie within the limit of the spread of the experimental points. It implicates that there is no possibility to reduce possible imperfections of the present calculations till better experimental values of both the cross-sections and swarm parameters become available. The reasons remain probably the same even if other methods for analyzing the behaviour of the electron swarms were applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01588936
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical analysis of glow discharge in oxygen (1979)
    Springer
    Czechoslovak journal of physics 29 (1979), S. 498-511 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Computational analysis of the positive column in a dc oxygen glow discharge was performed. Considering the discharge plasma as a mixture of electrons, positive molecular ions, negative atomic ions, metastable molecules O 2 * (a1Δg), atoms and molecules particle balance equations were solved. As a result the particle concentrations in a dependence on discharge parameters were obtained and the mechanism of the discharge was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600172
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of ambipolar diffusion on the positive column constriction in a cryogenic discharge (1978)
    Springer
    Czechoslovak journal of physics 28 (1978), S. 50-58 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An earlier theory concerning the positive column constriction is briefly summarized. This theory explains the constriction as a thermal effect: due to the heating the gas becomes rarefied near the tube axis and this results in a sharp increase of molecular ion production in the central part of the tube. The production is balanced by the dissociative (volume) recombination and the radial diffusion. The relevant equations are solved numerically for the wall temperature kept at −196 °C corresponding to the cooling of the walls by the liquid nitrogen. On example of this cryogenic discharge the influence of the ambipolar wall diffusion is examined in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01591307
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electron collision rates in oxygen glow discharge (1978)
    Springer
    Czechoslovak journal of physics 28 (1978), S. 1321-1334 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The calculations of the distribution function of electrons and the collisional rates were carried out on the basis of a numerical solution of the Boltzmann equation for a weakly ionized discharge in O2 rangingE/N from 5 Td to 200 Td. The distribution function, Townsend ionization and dissociative attachment coefficients calculated were found to be in good agreement with experiments. A comparison of the results on the collisional rates with the values available in the literature was performed as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01599705
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ionization waves (moving striations) in a low pressure helium discharge — results of measurements compared with a direct solution of the electron Boltzmann equation (1975)
    Springer
    Czechoslovak journal of physics 25 (1975), S. 660-676 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Boltzmann equation expanded in the angular dependence in the velocity space is solved numerically in one-dimensional approximation to obtain the perturbed distribution function. This perturbed distribution is integrated to construct the rate coefficients entering the atomic ion and the metastable continuity equations. From these balance equations the dispersion equations of the fast as well as slow ionization wave varieties are recovered. The space resonances of the electron gas described earlier give rise to the fast s and slow s' wave varieties observed in the positive column of the low current helium DC discharge. The existence regions of these waves are numerically evaluated and compared with experiment. Furthermore, the results on the wave phase velocities and dependence of the characteristic potential on the electric field are confronted with the experimental data. The theory, which involves no free or adjustable parameters, renders a resonable agreement in some points. Possible reasons for the observed discrepancies are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01591021
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of second kind collisions on the electron distribution function in the positive column of low pressure nitrogen discharge (1979)
    Springer
    Czechoslovak journal of physics 29 (1979), S. 407-421 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A numerical solution of the Boltzmann equation for the electron gas in the positive column of a DC discharge in nitrogen is presented. The Boltzmann equation was solved with the inclusion of the second kind (superelastic) collisions proceeding from the first six excited vibrational levels of molecular nitrogen. The vibrational level population is supposed to follow a Boltzmann distribution for a given vibrational temperatureT v, with a possible deviation of the ground level, which can be overpopulated in a given ratioγ. Apart from the electron distribution functions, which were gained for various values ofE/p 0,T v andγ, the values of some production frequencies and kinetic coefficients are presented in form of tables and plots. It is found that the electron distribution (and also the corresponding production rates) depends above a certain energy limit onT v andγ through the normalization constant only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596550
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A theory of the positive column constriction in the noble gas discharges at medium pressures (1976)
    Springer
    Czechoslovak journal of physics 26 (1976), S. 282-293 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theory explaining the positive column constriction in terms of a thermal effect is presented. As a consequence of the heating the neutral gas becomes more rarified near the tube axis and a locally increased molecular ion production ensues. If this is balanced by the dissociative (volume) recombination a constriction results at higher currents and pressures. The density profiles and other physical quantities are computed and compared with the available experimental data. All computations are performed for a non-Maxwellian plasma with the electron Coulomb interaction neglected. In contrast to the theories based on an ionization mechanism the thermal theory predicts also a constriction of the density profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594266
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    Paper (German National Licenses)
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