Accession Number : AD0441687


Title :   ABSORPTION COEFFICIENTS OF OXYGEN IN THE 1060580-A WAVELENGTH REGION,


Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA


Personal Author(s) : Huffman, R E ; Larrabe, J C ; Tanaka, Y


Report Date : 06 Sep 1963


Pagination or Media Count : 10


Abstract : Absorption coefficients of oxygen have been measured in the 1060-580-Angstrones wavelength region using a continum background at a bandwidth of 0.5 Angstrones. The background light source is a repetitive discharge through helium which produces the Hopfield continuum. Absorption bands and underlying dissociation and ionization continua are observed throughout this wavelength region. The continuum rises linearly from 20 cm-1 at the first ionization threshold (1026.7 Angstrones), to about 300 cm-1 at 840 Angstrones where the continuum begins to rise more sharply. Toward shorter wavelengths, there are three maxima in the continuum at about 800, 720, and 610 Angstrones with approximate k values of 850, 850, and 1000 cm-1, respectively. The absorption bands appear diffuse, probably due to pre-ionization, and maximum k values of up to 1700 cm-1 are found. Dissociation and ionization processes responsible for the continua are discussed, and comparison is made with previous absorption coefficient measurements. (Author)


Descriptors :   *OXYGEN , MEASUREMENT , IONIZATION , PRESSURE , EMISSIVITY , SOLAR SPECTRUM


Distribution Statement : APPROVED FOR PUBLIC RELEASE