摘要:

AbstractReaction and diffusion processes in dense plasmas are investigated on the basis of quantum statistical theory.Many particle effects lead to nonlinear expressions for reaction and diffusion coefficients.In the case of ambipolar diffusion and isobarity the plasma is described by only one reaction‐diffusion equation. Travelling front solutions and droplet formation are investigated in the approximation of constant diffusion. The influence of nonlinearity of the diffusion on these solutions as well as the possibility of phase separation via spinodal decompoisition and the formation of stable droplets are discusse

ISSN:0863-1042    

DOI:10.1002/ctpp.2150290422

出版商:WILEY‐VCH Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractA derivation of reaction‐diffusion equations for dense plasmas is given on the basis of quantum kinetic theory. Explicite expressions for the diffusion and reaction rate coefficients with a non‐linear density dependence can be obtained which are valid for nonideal plas

ISSN:0863-1042    

DOI:10.1002/ctpp.2150290423

出版商:WILEY‐VCH Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe cathode spot plasma of a metal vapour arc in vacuum is non‐ideal (electron densityne∼ 1025–1027m−3, temperatureT∼ 1–5 eV, plasma parameter Γ = 0.6−0.1). The fast expansion of the spot plasma into the ambient vacuum leads to a non‐equilibrium charge state distribution (“frozen” state of ionization). The calculations presented show that the freezing of the different charge states appears at different distances from the spot, therefore at different plasma densities and temperatures. In this way, specific proportions of the ion species are produced which do not agree with any equilibrium state. The freezing of the charge states occurs near the cathode spot (γ = 5–50 μm, γ — distance from the spot centre) where the plasma is wea

ISSN:0863-1042    

DOI:10.1002/ctpp.2150290424

出版商:WILEY‐VCH Verlag    

年代:1989

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150290425

出版商:WILEY‐VCH Verlag    

年代:1989

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150290401

出版商:WILEY‐VCH Verlag    

年代:1989

数据来源: WILEY