Zum Ähnlichkeitsgesetz der Ionisationswellen

Pfau, S.; Rutscher, A.

doi:10.1002/andp.19684770113

Cited by 9 publications

(10 citation statements)

References 4 publications

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“…Diese beruhen auf der groben Approximation des elastischen Querschnittes und der vereinfachten Darstellung der inelastischen Prozesse durch diese Autoren. Die genaueren Rechnungen von Hughes 17 in Helium und Neon dagegen, die allerdings nur einen kleinen Feldstärkebereich erfassen (E/p = 3 -40 V/cm Torr), bestätigen unsere Ergebnisse ebenso wie die vorliegenden experimentellen Werte. Darüber hinaus liefern unsere Rechnungen die experimentell wenig untersuchten Größen des Diffusions-und des Anregungskoeffizienten.…”

Section: Transportgrößenunclassified

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Elektronentransport in nichtthermischen Edelgasplasmen

Lehrke¹,

Müller²

1976

Zeitschrift Für Naturforschung A

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Transport of Electrons in Non-Thermal Noble Gas PlasmaFor the transport of electrons in a non-thermal, weakly ionized plasma an analytical model and a detailed numerical calculation is presented. The following transport coefficients: mean energy, characteristic energy, mobility, diffusion coefficient, excitation and ionization coefficient for He, Ne, Ar, Kr, Xe are calculated in the region of reduced electric field 0.01 V/cm Torr < Elp < 100 V/cm Torr. The parameters of the model are developed using the existing experimental and our numerical data. With increasing £/p the dominant energy loss of the electrons changes from elastic to inelastic collisions and here from constant to increasing effective excitation energy. Three model regions of Elp result, in which the transport coefficients can be described as a power of £/p. The data presented here provide a starting point for further investigations of similarity rules and models of nonthermal plasmas.

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Section: Transportgrößenunclassified

“…(4)], des Diffusions-und Anregungskoeffizienten. Die theoretischen Rechnungen [9][10][11][12][13][14][15][16][17][18][19] füllen diese Lücke nur unbefriedigend aus. Eine detaillierte Berechnung ist nur in einem kleinen Feldstärkebereich für Helium und Neon durchgeführt worden 16 .…”

Section: Introductionunclassified

Elektronentransport in nichtthermischen Edelgasplasmen

Lehrke¹,

Müller²

1976

Zeitschrift Für Naturforschung A

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“…This phenomenon has been discussed extensively, and a large amount of experimental data concerning this topic can be found in the older literature [l-51 and also in some newer publications [6-81. Also mixed states consisting of simultaneously existing stationary and moving striations have been observed in the artificially excited positive column of a glow-discharge system [9]. Another kind of instability can be found in the direction transversal to the current flow.…”

Section: Introductionmentioning

confidence: 90%

Experimental Observation of Simultaneously Existing Moving and Standing Patterns in a Gas‐Discharge System

Willebrand

Matthiessen

Niedernostheide

et al. 1992

Contrib. Plasma Phys.

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In a quasi 1-dimensional lateral gasdischarge system we observe experimentally sub-and supercritical bifurcations from a spatially homogeneous to an inhomogeneous distribution of the current density. Among other results we find for the first time the simultaneous existence of a nontrivial nonstationary pattern (travelling waves) with a nontrivial stationary pattern (periodic filaments) in a laterally extended dc-driven gasdischarge system.

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“…From experiments, in particular with rare gases, it is known that, under medium pressure the positive column can exist in a diffuse state and in a contracted state [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. The transition between the states occurs abruptly if the discharge current is varied [7,[11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…The contracted state occurs if the electron density exceeds a certain threshold. In contrast to the diffuse column, the contracted column is repelled from electrostatic probes [25]. One can suppose that the space-charge distribution of the contracted state is different from that of the diffuse state.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microparticles on Acousto-Optic Diffraction in Water

Izumida¹,

Hayashi²,

Saito³

1997

Jpn. J. Appl. Phys.

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Using a two-fluid model it is shown that bounded collisional plasmas can exist in two different states if the plasma generation is localized within a small region and volume recombination processes occur in addition to the recombination at the wall. First, there is the well-known diffuse state involving a positive boundary sheath. Second, in the so-called breeze state a slightly positive plasma core is surrounded by a broad zone with very slightly negative space-charge density. In this case, the drift velocities of the ions and the electrons pass through a maximum and, then, tend to very small values if the distance from the plasma source becomes large. The half width of the density profile of the charged particles is smaller in the breeze state than it is in the diffuse state. The transition between the two states occurs within a small interval of the relevant parameters. The variations in the ion drift velocity, the electric field and the space-charge density caused by the transition are more characteristic than is the variation in the density profile of the electrons. The occurrence of the breeze state is assisted by outwards decreasing temperatures of the electrons and the ions. The results hint that the contracted positive column represents the breeze state of a plasma.

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Zum Ähnlichkeitsgesetz der Ionisationswellen

Cited by 9 publications

References 4 publications

Elektronentransport in nichtthermischen Edelgasplasmen

Elektronentransport in nichtthermischen Edelgasplasmen

Experimental Observation of Simultaneously Existing Moving and Standing Patterns in a Gas‐Discharge System

Effect of Microparticles on Acousto-Optic Diffraction in Water

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