Author: Gabriel Sunshine
Publisher:
ISBN:
Category :
Languages : en
Pages : 172

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Author: Gabriel Sunshine
Publisher:
ISBN:
Category :
Languages : en
Pages : 39

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The atom beam recoil technique was used to measure absolute total cross sections for the scattering of electrons by atomic and molecular oxygen at 22 energies between 0.5 and 11.3 eV, with additional data obtained up to 100 eV. In this method, a modulated electron beam cross-fires an atom beam, whose attenuation at the modulation frequency is observed. The angular resolution in the electron polar scattering angle ranges from about 15.6 degrees at 1 eV to 9.6 degrees at 12 eV, for 0, and from about 18.5 degrees at 1 eV to 11.4 degrees at 12 eV, for 02. Our absolute values for 02 between 0.5 and 11.3 eV are between 10 and 20% higher than those of Bruche, while the shape of the curve agrees well. The atomic cross sections vary from about 5.3 sq. A at 0.5 eV to 8.3 sq. A at 11.3 eV, with an estimated error of 20% except for the 0.5 eV point which has an error of 30%. These results are in excellent agreement with semi-empirical calculations of Cooper and Martin and Robinson and Geltman, as well as with the polarized orbitals calculation of Temkin. (Author).

Author: Robert K. Jones
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 246

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Author: R. H. NEYNABER
Publisher:
ISBN:
Category :
Languages : en
Pages : 1

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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).

Author:
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ISBN:
Category : Weights and measures
Languages : en
Pages : 582

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Author:
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ISBN:
Category : Science
Languages : en
Pages : 182

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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 300

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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 612

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Author:
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 900

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Author:
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 626

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