Accession Number : AD0694062

Title :   ABSOLUTE CHEMILUMINESCENT REACTION RATES FOR EMISSION OF THE O2 HERZBERG BANDS IN OXYGEN AND OXYGEN-INERT GAS AFTERGLOWS,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : McNeal,Robert J. ; Durana,Stephen C.

Report Date : 15 JUL 1969

Pagination or Media Count : 28

Abstract : Chemiluminescent reaction rates for emission of the O2 Herzberg bands in the O2 and O2 + He or Ar afterglows have been measured in a discharge-flow system. Absolute intensities were measured between 260.0 nm and 420.0 nm at 0.5-nm resolution with a scanning spectrometer, and oxygen atom densities were determined by NO2 titration. Intensities were obtained as a function of atom density, O2 pressure, and partial pressures of added nonreactive gases. The integrated intensity of the Herzberg band system is proportional to the square of the oxygen concentration and independent of O2 pressure between 1 and 10 torr. The A triplet Sigma(u)(+) state of O2 is quenched by ground state O2, and the Herzberg bands are stronger in mixtures of O2 with He or Ar than in pure O2. The vibrational population distribution is shifted to lower vibrational levels of O2 the square of the oxygen concentration in the O2 - inert gas mixtures than in pure O2. (Author)

Descriptors :   (*OXYGEN, *CHEMILUMINESCENCE), (*AFTERGLOWS, OXYGEN), QUENCHING(INHIBITION), MOLECULAR ENERGY LEVELS, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA

Subject Categories : Atmospheric Physics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE