Accession Number : AD0468338


Title :   EFFECTIVE COLLISION FREQUENCIES AND ELECTRIC CONDUCTIVITIES OF WEAKLY IONIZED N2, O2, N, O, NO, AND DRY AIR


Descriptive Note : Research paper


Corporate Author : INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA


Personal Author(s) : Hochstim, Adolf R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/468338.pdf


Report Date : Feb 1965


Pagination or Media Count : 168


Abstract : In calculating the electric conductivity of gases and plasmas, it is not sufficient to define only one effective collision frequency. Two independent quantities are defined and tabulated as a function of the ratios of microwave frequency to an average collision frequency for very weakly ionized O2, N2, and dry air, for 100 K or = T or = 2000 K, using the best experimental electron- neutral cross sections. The average electron-neutral collision frequency (defied for microwave frequencies which are much greater than collision frequency) was tabulated for N2, O2, N, O, NO, and air for T or = 10,000 K. Also included are tables for an idealized singlecomponent weakly ionized gas whose collision frequency has a power law dependence on the velocity (with the exponent in the range of -3 to +3). The data could be applied to the interpretation of the attenuation of electromagnetic waves through the ionosphere, through rocket exhausts, in plasma diagnostics, radar blackout, reentry phenomena, etc.


Descriptors :   *PLASMAS(PHYSICS) , *GASES , MATHEMATICAL MODELS , PROPAGATION , SCATTERING , QUANTUM THEORY , MICROWAVES , ELECTRICAL CONDUCTIVITY , ELECTRONS , NITROGEN COMPOUNDS , CORRECTIONS , MOMENTUM , ARGON , ELECTRON IRRADIATION , TABLES(DATA) , IONIZATION , OXIDES , DIELECTRIC PROPERTIES , OXYGEN , NITROGEN , ATOMS , ENERGY , EXPERIMENTAL DATA , AIR , MOLECULES


Subject Categories : Physical Chemistry
      Plasma Physics and Magnetohydrodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE