摘要:

AbstractFür eine typische Impulslaser‐Gasentladung in ruhendem Stickstoff wird das zeitliche Verhalten der Schwingungstemperatur zwischen zwei Entladungsimpulsen rechnerisch untersucht, wobei eine verallgemeinerte Treanor‐Verteilung der Besetzung der Schwingungsniveaus zugrunde gelegt wird. Als Abbauprozesse der Schwingungsenergie werden Wandstöße, VV‐ und VT‐Prozesse berücksichtigt. Es ergeben sich Angaben über die Schwingungstemperatur zu Beginn jedes neuen Entladungsimpulses und über die Gastemperaturerhöhung gegenüber der Rohrwand in Abhängigkeit von der Folgefrequenz. Abschließend wird diskutiert, welche Einflüsse die erhöhten Schwingungs‐ und Gastemperaturen auf die Leistung des Stickstoff‐Im

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240602

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractWe consider the nonlinear surface deformation of a plasma which is confined by external fields. It then turns out that a perturbation of the plasma‐vacuum boundary can propagate as a solitary wave with a velocity that depends on the external radiation intensit

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240603

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractBy Whitham's method of averaged Lagrangian and using Low's form of Lagrangian, coupled mode equations and coupling coefficients are derived for resonant nonlinear interaction of two longitudinal and one transverse wave in a magnetized plasma, in which the later wave propagates along the external uniform magnetic field. The limiting form of these coupling coefficients are obtained when the external magnetic field vanishes.

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240604

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractThe evolution of a resonant triplet of linearly stable electrostatic waves in a beam‐plasma system is considered. A set of nonlinear ordinary differential equations is derived, which allow an investigation of the explosive instability with minimum numerical expense. Our model is different from the well known single wave model in taking into consideration the nonlinear susceptibility of the plasma and in making use of the ponderomotive force description. Maximum values of the wave amplitudes are obtained numerically and it is shown that the saturation of the explosive instability is due to different trapping mechanisms of the beam electrons by the excited wave

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240605

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractIn a dc argon discharge column of pressure 5 × 10−4torr, ion acoustic waves are studied experimentally. Plasma parameters obtained from the phase velocity of waves are compared with the Langmuir probe measurements. The wave diagnostic method yields the electron temperature lower than the probe method by a factor of 3…︁5, if the atomic argon ion is assumed as a dominant ion species. The axial profiles of ion drift velocity show the presence of ions flowing toward the anode along the potential drop in flont of it. Also it is found that the surface condition of the cathode sensitively affects the propagation of ion acoustic waves through the changes in discharge para

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240606

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractIn diesem Beitrag wird ein modifiziertes Verfahren der Mikrowellendiagnostik vorgestellt, das den Einfluß der Instabilitäten des Plasmas auf die Meßgenauigkeit stark herabset

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240607

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractIt is shown that the growth of a dense array of chromium microneedles is induced on a field cathode tip interacting with a negative corona discharge in ambient Cr(CO)6of 1 – 5 × 10−2Torr. The growth begins with the initiation of a corona discharge surrounding the tip, and it proceeds as long as the discharge is sustained. The needles emit field electrons during the growth, thereby sustaining the discharge, while the discharge lengthens the needles by supplying metallic particles to their tips. The morphological structure of the needles is strongly affected by an external magnetic field, leading us to hypothesize that the needle grow axially as the electron avalanches, originating at the cathode tip, propagate outward from

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240608

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractThe decomposition of carbon dioxide was studied in an argon plasma jet, generated by a direct‐current arc discharge. The decomposition degree of carbon dioxide was up to 0,4 at an effective energy consumption lower than 1 MJ/mole CO. The efficiency of high‐temperature decomposition of carbon dioxide to carbon monoxide and oxygen is essentially dependent both on the quenching intensity of the products, which prevents from the reverse oxidation reaction in the system, as well as on the proper conditions of plasma‐substrate m

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240609

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractInvestigations are reported of growth rate, chemical structure (IR‐spectroscopy, mass‐spectrometry), thermal stability, surface structure (scanning electron microscopy) of thin polymeric films grown in a gas (Ar‐hexamethyldisiloxane‐mixture) discharge with a heated cathode, which is situated in the centre of a cylindrical metallic vessel (l= 50 cm, 2r= 30 cm).The discharge conditions are the following:I= 0,25 – 4 A,U= 30 – 100 V,p= 6 – 40 Pa, argon flow rate = 3,8 · 10−5mol/min, Ar/HMDS = 1 : 0,7 – 1 : 2,4.The growth rate changes from 2 to 18 nm/min, depending on the discharge conditions. The reproducibility of the growth rate shows deviations smaller than 10%. The films consist of a highly cross linked polymeric material and are stable up to 260°C, the solubility in n‐hexane being smaller than 2%. The surface of the thin film (d∼ 102nm) is smooth. Corrosion resistance to soda lye (0,2

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240610

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractEs wurde der plasmachemische Abtrag von GaAs durch CCl4und CF2Cl2bei unterschiedlichen Leistungen eines 27,3 MHz Generators und unter Zusatz von Sauerstoff gemessen. Zur Interpretation der erhaltenen Ergebnisse wird ein einfaches kinetisches Modell vorgeschlagen.

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240611

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY