Transport Coefficients and Cross Sections in Argon and Hydrogen-argon Mktures
نویسندگان
چکیده
*' * tla "fig ■ MII V tkmi dMMibod pmviuuel/^the distribution function of electron energies for electrons in argon and mixtures of hydrogen and argon obtained by a numerical solution of the Boltzmann equation which takes Into account elastic and inelastic collisions. By taking appropriate averages over the distribution function, the electron drift velocity w, magnetic drift velocity w^i and characteristic energy «j^are computed. A comparison of calculated and experimental values of these transport coefficients enables us, in the case of pure argon, to extend the previous work of Frost and Phelps and derive the mooentum transfer cross section from 0.7 to 25.0 eV. The momentum transfer and inelastic collision cross sections derived in this paper for ergon and previously for hydrogen give rise to transport coefficients in mixtures of ch&sc two gases which are consistent with most of the available experimental * This research was suppovtod in part by the Advanced Research Projects Agency through the Office of Naval Research.
منابع مشابه
Absolute Doubly Differential Cross Sections for Ejection of Secondary Electrons from Gases by Electron Impact. II. 100-500-eV Electrons on Neon, Argon, Molecular Hydrogen, and Molecular Nitrogen
متن کامل
Electron scattering and transport in liquid argon.
The transport of excess electrons in liquid argon driven out of equilibrium by an applied electric field is revisited using a multi-term solution of Boltzmann's equation together with ab initio liquid phase cross-sections calculated using the Dirac-Fock scattering equations. The calculation of liquid phase cross-sections extends previous treatments to consider multipole polarisabilities and a n...
متن کاملMonte Carlo simulation of non-conservative positron transport in pure argon
The main aim of this paper is to apply modern phenomenology and accurate Monte Carlo simulation techniques to obtain the same level of understanding of positron transport as has been achieved for electrons. To this end, a reasonably complete set of cross sections for low energy positron scattering in argon has been used to calculate transport coefficients of low energy positrons in pure argon g...
متن کاملPositron transport: The plasma-gas interface
Motivated by an increasing number of applications, new techniques in the analysis of electron transport have been developed over the past 30 years or so, but similar methods had yet to be applied to positrons. Recently, an in-depth look at positron transport in pure argon gas has been performed using a recently established comprehensive set of cross sections and well-established Monte Carlo sim...
متن کاملXenon diffusion studies with prompt gamma activation analysis
Developing a better understanding of xenon transport through porous systems is critical to predicting how this gas will enter the atmosphere after a below ground nuclear weapons test. Radioxenon monitoring is a vital part of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System. This work details the development of prompt gamma activation analysis for measuring the di...
متن کامل