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  • 1
    Electronic Resource
    Electronic Resource
    Spatiotemporal evolution of a low-pressure glow discharge (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6694-6699 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatiotemporal evolution of a pulsed low-pressure glow discharge is investigated theoretically and experimentally. The discharge is modelled phenomenologically by a reaction-diffusion equation in which the cathode fall and the negative glow of the discharge are described as a bistable layer. A laterally one-dimensional discharge is realized experimentally by a hollow cathode discharge in a slotted cathode. With the help of probe measurements, a homogeneous evolution with a laterally uniform current rise and an inhomogeneous evolution starting from special sites and progressing along the cathode are found. The main experimental results are reproduced by model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349843
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of the expanding plasma of an anodic vacuum arc (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3625-3629 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An aluminum plasma is produced by an anodic vacuum arc (25 A, 17 V) with a consumable anode. The plasma expands from the anode to the walls and is investigated by Langmuir probes, a quadrupole mass spectrometer, a retarding field ion energy analyzer, and a quartz-crystal oscillator for mass flow detection. The electron density ranges within 2×1015–3×1017 m−3 and the electron temperature within 0.4–0.9 eV. At a target, ion fluxes of 1.5×1019–8×1020 m−2 s−1 and total particle fluxes of 3×1020–4×1021 m−2 s−1 are measured. The ions are accelerated in the expanding plasma towards the target and gain a few eV. By a simple collisionless transport model of the expanding plasma, the plasma potential and floating potential are calculated and compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345315
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  • 3
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    Unknown
    Ploetz: Auszug aus der Geschichte. - Hauptdaten der Weltgeschichte. - Geschichte des 2. Weltkrieges. - Rönnefahrt: Konferenzen und Verträge (Book Review) (1953)
    Köln : Periodicals Archive Online (PAO)
    Zeitschrift für Religions- und Geistesgeschichte. 5 (1953) 189 
    Details
    ISSN: 0044-3441
    Topics: History , Philosophy , Theology and Religious Studies
    Notes: BUCHBESPRECHUNGEN
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6475-1953-005-00-000084
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  • 4
    Electronic Resource
    Electronic Resource
    Mass spectrometer-wall probe diagnostic of Ar discharges containing SF6 and/or O2: Reactive ions in etching plasmas (1984)
    Springer
    Plasma chemistry and plasma processing 4 (1984), S. 107-118 
    Details
    ISSN: 1572-8986
    Keywords: Negative ions ; positive ions ; etching plasmas ; SF6 ; O2
    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 Positive and negative ions of Ar/SF6 and Ar/SF6/O2 plasmas (etching plasmas) and of Ar/O2 plasmas (cleaning plasmas) in Pyrex tubes have been investigated using a mass spectrometer-wall probe diagnostic technique. The measurement of negative ions proved to be a very sensitive method for the detection of wall material. In etching plasmas with small admixtures of SF6, oxygen was found as the only representative of wall material. At larger amounts of SF6, silicon could be detected. In cleaning plasmas with small admixtures of O2 applied to a previously etched Pyrex surface, fluorine was found, indicating the reversal of fluoridation by oxygenation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647191
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  • 5
    Electronic Resource
    Electronic Resource
    Plasmapolarisation und Trägerwechselwirkung (1958)
    Springer
    The European physical journal 153 (1958), S. 317-330 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Anwendbarkeit der Debye-Hückelschen Theorie auf das Plasma wird diskutiert. Zu der Onsager-Kirkwood-Bedingung tritt eine Forderung hinzu, deren Form davon abhängt, ob Mittelwertbildung möglich ist oder nicht. Die allgemeine Formulierung der Kraftwirkung auf neutrale und geladene Teilchen wird durch die Separation der individuellen und kollektiven Komponenten in auswertbare Form gebracht. Dies liefert die Begründung des Polarisationsmodells, welches hier — wie in I — zur Erfassung der kollektiven Wechselwirkung verwendet wird. Es zeigt sich ferner, da\ von der gesamten individuellen Wechselwirkung nur der Bruchteil von Bedeutung ist, der zur Aufpunktfeldstärke in Korrelation steht. Diese Korrelation bedingt im Bereichδ}〉1 Unterschiede zwischen neutralem und geladenem Aufpunkt nur bei extremen Feldstärken. Die maschinelle Auswertung unter voller Berücksichtigung des Debyeschen Feldverlaufes gelingt ohne Vernachlässigungen. Das Grenzverhaltenδ=0 wird untersucht. To begin with we discuss the applicability of Debye-Hückel-Theory to the plasma. In addition to the well known Onsager-Kirkwood-condition we find another limitation which depends on whether averaging is possible or not. The general formulation of the force on a neutral or charged particle can be simplified by making use of the separation in individual and collective components. The result justifies the polarisation-approximation used here and in I to account for the collective interaction of the system. Moreover we find that only that fraction of the individual interaction energy is of importance which shows correlation to the field at the origin. This correlation causes differences in the results for neutral and charged particles. As long asδ〉0 holds this difference is restricted to large fields. In contrast to I we were able to carry through the evaluation without using the cutoff-approximation. Furthermore we investigate the relations near the limit δ=0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01329039
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  • 6
    Electronic Resource
    Electronic Resource
    Theorie der „Retrograde Motion“ (1958)
    Springer
    The European physical journal 151 (1958), S. 577-594 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Neuere Untersuchungen der „Retrograde Motion“ liefern interessantes experimentelles Material über die rückläufige Geschwindigkeit und die Lage des kritischen Punktes in Abhängigkeit von den verschiedenen Parametern (Stromstärke, Magnetfeld, Druck usw.). Bisher liegt keine Berechnung dieser Beobachtungen vor; verschiedene Modellvorstellungen zur Deutung des Effekts haben sich bei näherer Prüfung als unzureichend erwiesen. Wie eine sorgfältige Diskussion der Kathodenmechanismen zeigt, ist „Retrograde Motion“ bei dem stark kontrahierten, feldbestimmten Ansatz zwangsläufig zu erwarten. Von entscheidender Bedeutung ist hierbei einerseits die gegenseitige Abhängigkeit von Ionen- und Elektronenerzeugung, andererseits die Kopplung der Bewegung der Ladungsträger. Die rechnerische Ausführung erreicht in den wesentlichen Punkten Übereinstimmung mit den Experimenten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338428
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  • 7
    Electronic Resource
    Electronic Resource
    Propagation and deflection of guided modes in planar waveguides via grating rotation (1995)
    Springer
    Applied physics 60 (1995), S. 1-4 
    Details
    ISSN: 1432-0649
    Keywords: 42.10 ; 42.80 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Propagation and deflection of guided modes in a polymer slab waveguide is studied. Rotation of the grating structure with respect to the plane of incidence deflects the waveguide modes in the plane of the sample so that the propagation direction is no longer perpendicular to the grating grooves. The deflection angles are measured as a function of the grating rotation angle and the experimental results are compared with theoretically expected values. The difference in polarization behaviour between waveguide and plasmon surface polariton grating rotation coupling is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082065
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  • 8
    Electronic Resource
    Electronic Resource
    Mass spectrometer-wall probe diagnostic of Ar discharges containing SF6 and/or O2: Reactive Ions in Etching Plasmas (1985)
    Springer
    Plasma chemistry and plasma processing 5 (1985), S. 89-89 
    Details
    ISSN: 1572-8986
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567912
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  • 9
    Electronic Resource
    Electronic Resource
    Dielektrische Wellenleiter als Plasmasonden (1967)
    Springer
    The European physical journal 200 (1967), S. 541-555 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microwave interferometer is described, by which the electron density in a small volume inside of a plasma can be measured. By dielectric rods acting as waveguides the microwave is led to this volume. For a given electron density the phase shift is calculated for this volume and for the dielectric rods. By a suitable choice of the radius and the dielectric constant of the rods the phase shift along the rods can be surpressed. The influence of plasma sheaths is discussed. In a special application to the plasma of the negative glow these interferometric measurements are compared with Langmuir probe measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326244
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  • 10
    Electronic Resource
    Electronic Resource
    Striations als Eigenlösungen der Elektronenbewegung im elektrischen Feld (1973)
    Springer
    The European physical journal 263 (1973), S. 299-314 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple model for the motion of electrons in an inhomogeneous electric field is derived. With this model the striations in a weakly ionized low pressure discharge can be explained as a phenomenon of the energy relaxation. In a periodical electric field resonances occur, for which the voltage across one striation equals the average energy gain of an electron between two inelastic collisions, divided by an integer. These resonances are recognized as eigensolutions in the homogeneous field. The influence of the elastic and ineiastic collisions on the damping of the striations is discussed. In a first approximation the energy loss at the elastic collisions can be taken into account by a frictional contribution to the voltage across one striation. This voltage and the energy distribution function in moving striations are calculated and compared with measurements of other authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01391589
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