Accession Number : AD0269384

Title :   LOW-ENERGY ELECTRON SCATTERING FROM ATOMIC OXYGEN

Corporate Author : GENERAL DYNAMICS/POMONA CALIF

Personal Author(s) : NEYNABER,R.H. ; MARINO,L.L.

Report Date : FEB 1961

Pagination or Media Count : 1

Abstract : The total cross section for the scattering of electrons by atomic O was measured as a function of electron energy from 2.3 to 11.6 ev. The number of electrons scattered from a region defined by the intersection of an electron beam and a modulated molecular O beam was compared with the number scattered when the O beam was partially dissociated. A radio-frequency discharge dissociated about 30% of the molecules. The degree of dissociation was measured with a mass spectrometer. From the data, the ratios of atomic to molecular scattering cross sections were obtained. The absolute atomic values were calculated by multiplying these ratios by the molecular O cross sections obtained by Bruche (Ann. Physik 83:1065, 1957). The result is a virtually constant cross section of 6.2 ! 0.5 a2o in the entire energy range studied. These results are compared with 5 theoretical estimates. (Author)

Descriptors :   *ATTENUATION, *OXYGEN, ATOMS, DISSOCIATION, ECONOMICS, ELECTRON BEAMS, ELECTRON GUNS, ELECTRONS, GAS DISCHARGES, IONIZATION, MATERIALS, MEASUREMENT, MOBILIZATION, MOLECULAR BEAMS, RADIOFREQUENCY

Distribution Statement : APPROVED FOR PUBLIC RELEASE