The electrical conductivity of fully ionized, nondegenerate hydrogen plasma is expressed within the Zubarev method by equilibrium correlation functions. Using the Green’s function technique, the Lenard–Balescu–Gurnsey collision integral of a generalized Boltzmann equation is derived that accounts for the effects of dynamic screening. Applying the usual random phase approximation, numerical results for the collision integral and the electrical conductivity are compared with the case of static screening (ω=0) and the long-wavelength limit (q→0) for the dielectric function Ε(q,ω). Effective low-density expansions are given for the collision integrals as well as for the electrical conductivity that are applicable for a wide range of density and temperature.
The time-dependent wave function of a nanoring driven by a laser field is obtained by exploiting the symmetries\ud
inherent to the system and used for studying the properties of the electromagnetic radiation emitted by the\ud
nanoring as a function of the polarization state of the laser. The diffused radiation has the characteristics of\ud
high-order-harmonic generation. For a noncircularly polarized laser field an extension of the expected cutoff\ud
position is evident, indicating that nanorings are efficient sources of radiation. The polarization state of the\ud
emitted harmonics can be opportunely controlled by varying the parameters of the pump field. The profile of\ud
the absorbed angular moment shows that a magnetic moment can be induced depending on the polarization of\ud
the driven field
A kinetic equation with a composed collision term (Boltzmann +-Lenard-Balescu-Landau) is solved numerically. Dynamical screening is taken into account in the e-e-scattering. The conductivity of a fully ionized H-plasma was calculated. In comparison to static screening dynamical screening tends to lower the conductivity.
General RemarksSince the publication of the classical work of SPITZER, HARM, LANDSHOFF and others [l, 21 many papers were devoted to the conductivity of a fully ionized gas. The flow of publications about this issue is going on up to now [3]. There are two approaches used to treat the problem. The first is based on linear response theory due to KUBO or ZUBAREV[4] and the second one starts from kinetic equations [5]. The present contribution refers to the latter. The aim of this paper is to obtain quantitative results for the influence of dynamic screening on the conductivity of a homogeneous and fully ionized electronproton plasma. Because of their great mass we shall neglect the current produced by the protons. Then we have t o deal with only one kinetic equat,ion for electrons. We start from a kinetic equation which is due to DEWITT et al. [5].
Basic EquationsWe are dealing with a nondegenerate plasma. I n the stationary state the electron distribution function f(pl) satisfies the equation of GOULD, WILLIAMS and DEWITT [5]--el? ~PJ(P1)
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