Accession Number : AD0700370

Title :   EXPERIMENTAL DETERMINATION OF ELECTRON CONCENTRATIONS AND EFFECTIVE FREQUENCIES OF ELECTRON COLLISIONS WITH NEUTRAL PARTICLES IN AIR, N2, O2, CO, ARGON, AND CO2 BEHIND SHOCK WAVES,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Lobastov,Yu. S.

Report Date : 01 OCT 1969

Pagination or Media Count : 22

Abstract : Measurement of radio-wave absorption simultaneously at two frequencies of 37,500 MHz and 18,750 MHz behind a reflected wave in a shock tube indicated that equilibrium ionization is achieved in air and in nitrogen during times of 70-17- Mu sec at 2800-4800 degrees K and at pressures of 0.3-6.20 atm. Comparison of absorption curves with Topler scan of the process of shock wave reflection from the end of a tube made it possible to explain the significant increase of conductivity after it reached an equilibrium value as a result of the additional heating of the gas by the shock wave being reflected from the interface. The measured values of effective cross-sections of electron collisions with neutral particles in air, nitrogen and CO are quite close to the data found in other papers. However, the cross-section tends toward a sharper increase in nitrogen at temperatures higher than 4000K. Cross-section values in molecular oxygen and in CO2 were significantly less in the present investigations than those found by others. (Author)

Descriptors :   (*PLASMA MEDIUM, ELECTRON DENSITY), (*MOLECULES, *ELECTRON IRRADIATION), (*SHOCK WAVES, PLASMA MEDIUM), SHOCK TUBES, AIR, CARBON DIOXIDE, NITROGEN, OXYGEN, CARBON DIOXIDE, GAS IONIZATION, CARBON MONOXIDE, ATMOSPHERES, RADIOFREQUENCY SPECTROSCOPY, USSR

Subject Categories : Atmospheric Physics
      Atomic and Molecular Physics and Spectroscopy
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE