Accession Number : AD0667961

Title :   DETERMINATION OF PRINCIPAL REACTIONS IN 4:1 MIXTURES OF N2 AND O2 DURING AND AFTER PULSED IONIZATION,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Niles,Franklin E.

Report Date : DEC 1967

Pagination or Media Count : 67

Abstract : Computer solutions were obtained for 15 simultaneous differential equations which describe the time rate of change of electrons, NO2(-), O(-), O2(-), O3(-), N2(+), NO(+), O(+), O2(+), N, NO, N2O, NO2, O, and O3 during and after pulsed ionization. The calculations were made for a 4:1 mixture of N2 and O2 at a total pressure of 5 Torr. Ionization was repetitive at a rate of 8.05 x 10 to the 9th power ion pairs/cu cm/sec for about a half second and zero for about a half second. The number densities at the end of the sixth pulse of ionization were used as initial number densities for calculations in which ionization was not applied. These calculations yield the afterglow solutions. The afterglow solutions reveal that (1) NO(+) is the only important positive ion throughout the afterglow period, (2) the most important negative ion changes progressively with time from O2(-) to O3(-) to NO2(-), and (3) other than N2 and O2, NO is the most important neutral species throughout the afterglow with NO2 and N2O being the only other neutrals remaining in the very late afterglow. The interconnection of the ions and neutrals via reactions during the early afterglow is shown by a schematic diagram. (Author)

Descriptors :   (*GAS IONIZATION, CHEMICAL REACTIONS), (*OXYGEN, CHEMICAL REACTIONS), (*NITROGEN, CHEMICAL REACTIONS), AFTERGLOWS, ELECTRONS, NITROGEN OXIDES, IONS, REACTION KINETICS, DIFFERENTIAL EQUATIONS, NUMERICAL ANALYSIS, AIR, COMPUTER PROGRAMS

Subject Categories : Atmospheric Physics
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE