摘要:

AbstractThe present work deals with the spectroscopic investigation of Penning ionization and nonresonant charge exchange due to thermal‐energy collisions of metastable atoms or ions of the inert gases He, Ne with atoms of alkali metals K, Rb, Cs in a low temperature plasma of the corresponding binary mixtures. The rate constants of these reactions and partial rate constants of exciting several alkali metal ion levels were determined by the kinetics of the decay of ionized and excited particles in the afterglow of a pulsed discharge. Measured Penning and charge exchange constants are in order of 1010‐9cm3sec−1. Partial Penning constants in the HeCs system exhibit a small dependence of the energy defect of reaction, whereby an important part of collisions results in excited Cs+‐states. On the contrary, energy transfer by charge exchange in HeRb, Cs systems distinguishes by a significant energy defect dependence. Charge exchange from He+to Rb0leads above all to He(23S1)‐atoms and normal Rb+‐ions. It follows from the metal ion spectrums, that Penning ionization and charge exchange of the investigated systems under utilized conditions represent as processes of selective excitation of alkali metal ions in afterglow and stati

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220502

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractIn the theoretical description of mixture plasmas used in fluorescent lamps a Maxwellian energy distribution and a two‐electron‐group model has been applied to determine the transport quantities and the main collision rates of the electrons. For various parameters, especially for a wide range of the ionization degree we calculated the electron energy distribution function for the ArHg plasma from the Boltzmann equation taking into account all important elementary processes and the Coulomb interaction. Further, we made a self‐consistent determination of the ionization degree additionally applying the current balance. In this way the energy distribution function and resulting transport coefficients, collision and energy transfer rates of the electrons were calculated and a comparison with the above models was performed. An interesting finding was that they satisfactorily describe the low energy part of the energy distribution, whilst in the tail of the distribution there is a gradually underpopulation as compared to the models. Furthermore, calculated and experimental results are c

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220503

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe present paper investigates the discharge modes in neon. The Ne‐discharge is shown to be sensitively influenced by impurities or small admixtures. If the Ne‐filling is not pure enough, pulse mode and continuous mode occur in the same way as in a NeN2mixture. But below a nitrogen content of 0.01% the shift of the transition frequency between the pulse mode and continuous mode disappears. If the measurements were carried out in pure neon, the non‐bistable continuous mode could not be observed, which indicated that the main ionization mechanism, the Penning ionization, had vanished. Instead, in the corresponding parameter range a bistable discharge occurred. This discharge, representing the quasiglow mode, is more intense and the discharge current persists for the whole half cycle.Furthermore, the present paper investigates the wall voltage build up. The charge‐transfermethod was extended to the quasiglow mode and the continuous mode. The observed changes in the charge‐transfer‐curves can be explained by the different dischar

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220504

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe efficiency of energy dissipation caused by the mechanism of turbulent plasma heating from a tube‐like electron beam in a electronegative gas is measured calorimetrically. Amorphous Si‐layers are deposited from a SiH4/Ar discharge both on conducting and nonconducting substrates and are analyzed by means of Auger‐spectrometry. The velocity and specific energy of etching of SiO2‐layers in a CF4‐plasma are determined.Measured etching velocities of tungsten surfaces biased differently against the space potential provide information on the mechanism of plasma etching in a SF6‐plasma. Simultaneously performed Langmuir‐probe measurements permit predictions to be made on the properties of the e

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220505

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractA survey on the properties and applications of the beam plasma discharge is given. A device for the experimental investigation of this discharge is described in which a magnetically guided (H= 0.05−0.1 T), ribbonlike electron beam (eU= 0.5–5 KeV,I= 10−3−1 A) passes through a working chamber (p= 0.1–10 Pa;l= 10 cm, ø = 22 cm). The beam plasma discharge is sustained by collective beam plasma interaction. First results concerning the wall current and the ignition of the discharge as dependent on beam parameters are

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220506

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractEnergetical properties of two different cascaded 100 kW‐H2‐plasma jets are treated. The losses of the heat are tested in dependence of the current. The influence of the geometrical place on the losses of heat in the plasma jet is shown. Questions of the adaption of the plasma jet to the power supply are discus

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220507

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractTheoretical predictions about heat sources, power dissipation and heating time scales are compared with available experimental data. It is concluded that the heating process must have a much faster time scale than quasi‐stationary heat conduction. This can be achieved only by ion impact heating. A special model is discussed (thin layer heating) which explains the high power dissipation within the cathode as well as the short heating time

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220508

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19820220501

出版商:WILEY‐VCH Verlag    

年代:1982

数据来源: WILEY