摘要:

AbstractElectron energy distribution functions (eedf) in CO2laser discharge (He—CO2—N2—CO mixture) have been calculated by solving the Boltzmann equation in the presence of given concentrations of excited (vibrational and electronic) states. The results show a well structured eedf as a result of second kind collisions coming from metastable electronic states of N2and He as well as a strong dependence of rate coefficients for CO2dissociation and for the ionization of the different sp

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310602

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractBased upon former studies concerning the nonstationary electron kinetics in collision dominated, weakly ionized plasmas the phase delay between the ac electric field component and the resultant ac electron current density has been analysed, theoretically and experimentally, under the specific conditions of a microwave field superimposed to a dc discharge plasma column. The complex plasma conductivity and thus the phase delay has been calculated by solving an appropriate electron kinetic equation. The same quantities have been experimentally determined by using the microwave cavity which operates with different resonator modes. A comprehensive comparison between calculated and measured quantities for different neon discharge plasmas leads to a complete confirmation of the theoretical expectations.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310603

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractAn experimental study of the evolution along the creation process of the plasma parameters characterizing a dc pulsed Argon discharge has been developed. The diagnostic of these parameters is based on theI — Vprobe characteristic technique. The electron density evolution values so measured are in a good agreement with those obtained from a theoretical model of this process, so the validity of the assumptions involving the model are confirme

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310604

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractWe present a collisional‐radiative model of helium plasma with explicit inclusion of metastable state influences and give results of numerical calculations of population coefficients and effective reaction rates (generalization of effective ionization and recombination coefficients for the case when metastable states are not explicitly included) for a large region of electron densities and temperatures for optically thin and thick helium plasma. The model is described in this pape

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310605

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractWe present results of our calculation of global population coefficients based on a collisional — radiative model of the helium plasma. The results are given for23P,21P,33S,31S,33P,31D,33D,31P,43and41states of helium atoms. We consider electron densities from 107to 1018cm−3and electron temperature from 1 to 10 eV. The electron distribution function is considered to be Maxwellian and the plasma to be radiatively t

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310606

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe dispersion properties of potential surface waves (SW), propagating at a warm nonisothermal plasma‐metal boundary across the external magnetic field are studied in this paper. The existence of potential SW is shown to be possible in frequency ranges, where electromagnetic SW do not exist. The influence of transverse plasma density inhomogeneity on dispersion properties of the SW considered is studied as wel

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310607

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractIn this paper, the various conditions under which the K‐dV solitons and double layers may be formed in a plasma that includes two electron‐temperatures are examined by deriving a “Further modified K‐dV” (FmK‐dV) equation in three dimensional space in which there is assumed to be an ambient magnetic field. Structural forms of the various ion‐acoustic waves are discussed by obtaining both soliton‐specific and double layer‐specific solitons of the FmK‐dV equation. Particular results are deduced as special cases of the

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310608

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractWe investigate generation and radiation of waves at combined frequencies from an arbitrary inhomogeneous, isotropic plasma layer, when electromagnetic waves are obliquely incident on it to interact with a surface wave at the plasma boundary. This interaction has been described for bothS‐ andP‐polarized waves. We consider a warm plasma layer with thickness very small as compared to the wavelengths of oscillations. It is shown that generated waves are strongly amplified, compared to cold plasma, when phase velocities of generated waves approaches the electron thermal velocity. Waves are not emitted whenP‐polarized waves are incident perpendicular onto the plasma

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310609

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractLow pressure microwave plasmas are of growing interest for plasmachemical applications since they have special and in some cases unique advantages with respect to other plasma excitation methods. Subject of this paper are spatially resolved measurements of the optical emission of a special planar microwave plasma source utilized to investigate different plasmachemical processes. The optical emission spectroscopy (OES) is used as a tool to get information concerning the spatially distribution of reactive atom and molecule concentration by actinometry and concerning the neutral gas temperature by measurements of Doppler line broadening. The results refer to hydrocarbon containing hydrogen plasmas which gas pressures above 100 Pa. Surprisingly measurements confirm an earlier developed simplified two layer model consisting of a preferentially physically active plasma layer near the microwave window followed by a preferentially chemically active decaying region. They give evidence that this model is more adequate to the real physical situation as assumed until now.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310610

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe work advances a discrete mathematical model of physico‐chemical reactions. Possibilities of the described model application for calculation of physico‐chemical systems with complicated behaviour are analy

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310611

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY