摘要:

AbstractThe elastic scattering of electrons on the cut‐off Coulomb potentialUc(r) = −1/r+ 1/rc, forr≦rcandUc(r) = 0, forr>rc, has been considered. It has been shown that for ε>0.5/rc(ε is the energy of free electrons in atomic units) the analytical quasi‐classical expressions describe quite well the behaviour of transport, differential and total cross sections for elastic scattering. It has been shown moreover, that in the energy range considered, transport cross section could be determined with practically the same accuracy already by means of classical, analytical expressions. Born approximations show larger deviations from exact quantum cal

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270102

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

摘要:

AbstractThe electron energy distribution function in CF4gas discharge was numerically calculated for density reduced electric fieldE/N= 15 ‐ 300 × 10−17Vcm2using the Boltzmann kinetic equation. The momentum transfer and vibrational cross‐sections were derived from available experimental swarm parameters while the cross‐sections for inelastic electron‐molecule collisional processes included were taken from the literature. The two‐term spherical harmonic expansion of the distribution function was used in the

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270103

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

摘要:

AbstractThe temperature and electron density distributions in a helium plasma produced near ceramic surfaces at atmospheric pressure have been studied. The determination of these plasma parameters is based on spatial resolved line intensity measurements.

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270104

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

摘要:

AbstractIt is possible to improve the resolving power at the determination of the resonance frequency and the cavityQby the timed modulation af a plasma loading the resonator. By this we get a higher exactness for the determination of the plasma parameters. The resonance curves obtained by aid of the differences of the output signals of the resonator result from the solutions of a nonlinear system of equations. The existence and uniqueness of the solutions are discussed in some special cases.

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270105

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

摘要:

Abstract1A computer model is designed in which the lamp voltage is obtained by solving the equations of the operating circuit.2The lamp resistance is determined by using hydrodynamic equations for the lamp plasma with following conditions:— three level model of Hg vapour ground, one lumped excited and the ionization level— direct and stepwise ionization are included as well as deexcitation and radiative decay— the plasma is controlled by ambipolar diffusion— no excitation and ionization of the buffer gas is assumed— both the buffer gas and neutral Hg atoms are considered to be equal distributed over the cross‐section of the discharge tube.3The model allows to calculate the main time dependent lamp parameters and their time averaged values.4We found a good qualitative and quantitative (about 1 to 5%) agreement compared with standard fluorescent lamps.5The model shows the tendency of lamp voltage increasing to smaller tube diameters.6The model gives qualitatively the right dependence of lamp efficacy on the buffer gas pressure.7The behaviour of the angle of lag and the power factor in dependence on the tube diameter obtained by the model shows also the right tendency.1Further calculations and experimental verifications are needed to reach several improvements o

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270106

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

摘要:

AbstractWe report here analytic solutions for weak ion acoustic double layers in an unmagnetized multi‐species plasma having two electron components, each described by a Boltzmann distribution, and two ions of different masses, each described by usual fluid equations. The velocity and the width of the double layers for different amplitude has been studie

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270107

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

摘要:

AbstractNonlinear behaviour of electron plasma waves propagating in a planar plasma‐loaded waveguide immersed in an infinite magnetic field is analysed including finite temperature and mobile ion effects. It is shown that the wave becomes modulationally unstable if the wavenumber exceeds certain critical valueKc, which decreases with rise of temperature. The growth rate of instability is calculated and is found to increase with the rise of temperatur

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270108

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270109

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19870270101

出版商:WILEY‐VCH Verlag    

年代:1987

数据来源: WILEY