摘要:

AbstractStimulated Brillouin Scattering has been investigated in a two‐electron‐temperature plasma and it is found that the growth rate can be controlled by injecting hot electrons in the plasma. For typical values of the magnetosphere plasmas the values of growth rates for different concentrations of hot to cold alectrons are calcula

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310102

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractUsing fluid model the propagation of the solitary wave has been analytically investigated in a plasma of two‐temperature electrons and ions. It is found that under suitable conditions ion‐acoustic solitons of compressive nature and electron‐acoustic solitons of rare‐factive nature ca

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310103

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractBy using the reductive perturbation technique, the soliton solution of an ion‐acoustic wave radially ingoing in a spherically bounded plasma consisting of ions and ion‐beams with multiple electron temperatures is obtained. In sequel to the earlier investigations, the solitary waves are studied as usual through the derivation of a modified Korteweg‐de Vries (K‐dV) equation in different plasma models arising due to the variation of the isothermality of the plasmas. The characteristics of the solitons are finally compared with those of the planar and the cylindrical s

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310104

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA supersonically expanding arc plasma in argon is analyzed both experimentally and theoretically. The plasma is created in a cascaded arc and extracted through a hole in the anode. It emanates in a large vacuum system, where it expands supersonically. This expansion is limited by a shock wave. After the shock wave a subsonic plasma beam is created. A quasi one‐dimensional model, based on the conservation of mass, momentum and energy is presented. The shock wave is treated as a discontinuity. The electron density, the gas velocity and the gas temperature are measured as a function of the position in the expansion by means of Stark broadening and Doppler spectroscopy. The model calculations agree well with the measurements, especially in the first part of the supersonic flo

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310105

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe article presents results of probe measurements of the electron and ion densities in an argon rf discharge. The electron density is determined from the electron probe current at the space potential which is estimated by extrapolation of the linear part of the probe electron current dependence to the plasma potential. The plasma potential is calculated from the floating potential. The positive ion density is determined from the probe ion saturated current according to collisional KOPICZYNSKI and ZAKREWSKI model [1]. The agreement between the electron and ion densities is better than in the work of HOPKINS and GRAHAM [2], where the collisionless Lafram‐boise theory is used under similar condition

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310106

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA method for obtaining a medium pressure (p∼ 1 torr), low power (<100 W), RF‐generated plasma jet, suitable for chemical kinetics studies and technological applications is described. Though various supply gases can be used to create the plasma jet, only results on the properties of a nitrogen jet are given in this paper with an emphasis on some spectral and electrical characteristics. The emission spectra of the nitrogen jet are discussed and spatial distributions of the relative concentration of nitrogen or radical impurities emitting species such as N2(C3Πu,v' = 0), NH(A3Πg,v'=0) in the bulk of the postdischarge plasma are calculated from the intensity of their vibrational bands. Electrical space resolved double probe measurements and the spatial distributions of the electron density and temperature in the plasma jet are also presented. Possible applications are shortly disc

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310107

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractOn the basis of existing experimental and theoretical results on Stark widths of neutral and multiply ionized states of krypton and xenon, we have indicated existence of certain regularities of Stark broadening forns‐nptypes of transitions. These regularities were used to estimate the Stark widths of spectral lines from KrIV and XeI spectra that have not yet been measured or calculate

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310108

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractIn a dc glow discharge in oxygen, the concentrations of minor components of O2(a1Δg), O2(b1Σg), O3, O(1D), as well as nagative ions and electrons have been measured. Balance equations have been derived which describe satisfactorily the stationary concentrations of these components as functions of gas pressure and discharge current. For the first time, the rate constants of important aeronomical reactions (a) O−+ O2(a1Δg) → O3+ e, (b) O2−+ O2(a1Δg) → 2O2+ e and (c) e + O3→ O2−+O have been measured as functions of gas temperatureTand mean energies of ionsEiand electronE6: Ka= (2.5 ± 0.5) · 10−9· (T/300)4 ± 0.4· (Ei/0.04)−2.6 ± 0.4cm3/s forT= 385−605 K andEi= 0.10 − 0.66 eV;Kb= (1.0 ± 0.3) · 10−10· (T/300)−2 ± 0.5· (Ei/0.04)0.23 ± 0.05cm3/s forT= 330−605

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310109

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractWe have undertaken an experimental investigation of the influence of the conditions of barrier discharge implementation such as: the discharge gap value, the type of gas, and the polarity and dielectric permittivity of the dielectric electrode on the value of charge transferred in a micro‐discharge. It is shown that the increase in the specific capacitance of the electrodes leads to proportional increase in the transferred charge value, reaching 100–200 nC in a discharge gap 1 mm, in air. In this case the amplitude and duration of a current pulse in the microdischarge reach, respectively, 10 to 15 A and 40 ns. It is also demonstrated that in air with increase in the discharge gap value one can observe a decrease in the efficiency of the ozone synthesis whereas in oxygen there exists a more complicated dependence: the maximum of efficiency is observed at a discharge gap value of 0.7 to 1.0

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310110

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA simple theoretical analysis of the discharge characteristics and the laser output performance of a discharge ‐ pumped XeCl‐laser is described. Validity of the model is confirmed by comparing the results with the measured time histories of the discharge voltage and current as well as with measured laser‐output‐energies. The model allows qualitative explanations with respect to the laser output energy in dependence on the total gas pressure, the concentrations of Xe and He as well as the load voltage of the power supply and the primary stored

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310111

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY