Total Cross Sections for Scattering of Electrons by Helium PDF Download
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Author: Eliasz Poss
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
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Author: Eliasz Poss
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
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Author: WARREN GRANT WILSON
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ISBN:
Category :
Languages : en
Pages : 134
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![Measurement of Absolute Total Cross Sections for the Scattering of Electrons by He, H2, CH4 and CCl[subscript N]F[subscript M] PDF](https://books.google.com/books/content/images/frontcover/7j0eAQAAMAAJ?fife=w80-h100)
Author: Robert K. Jones
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ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 246
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Author: Steven R. McNeany
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Category :
Languages : en
Pages : 47
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Author: D. E. Golden
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Category :
Languages : en
Pages : 8
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The Ramsauer technique has been used to measure the absolute total electron-helium-atom scattering cross section as a function of electron energy from 0.30 to 28 eV with an estimated probable error of =3%. No 'fine structure' has been observed at the lower electron energies studied. The variation of the cross section with energy for energies less than 3 eV is in reasonable agreement with the modified effective-range formula given by O'Malley, using a scattering length of 1.15a sub o. The cross section first increases with decreasing electron energy from 2.2 A sq at 28.0 eV to a maximum of 5.6 A sq at about 1.2 eV and then decreases to 5.4 A sq at 0.300 eV. The cross section has been found to decrease sharply with increasing energy at about 0.5 eV below the first excitation energy. This resonance, predicted by Baranger and Gerjuoy and originally observed by Schulz, first decreases with increasing energy to a minimum of about 10% below the background at 19.285=0.025 eV and then increases to a gentle maximum of about 3% above the background at 19.65=0.05 eV. The resolution of this resonance as well as the 10% decrease in the cross section at the minimum is determined by the half-width of the electron beam at this energy which is about 0.1 eV. (Author).
Author: S. P. Khare
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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The differential cross sections for the elastic scattering of electrons by helium atoms at a few selected electron impact energies, in the 10-50 eV energy range, are calculated by using the adiabatic-exchange phase shifts of Labhan and Callaway (1964) for the l = 0, 1 and 2 partial waves, and the static-dipole phase shifts for the higher partial waves. The calculated values are in satisfactory accord with the experimental data of Bullard and Massey (1931) and of Hughes, McMillen and Webb (1932) and with the theoretical values of Khare and Moiseiwitsch (1965), who included exchange only indirectly. The effect of quadrupole polarizability potential on the differential cross sections is also examined and is found to be small. (Author).
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 938
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Author: M. J. Brunger
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Category : Elastic scattering
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 900
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Author: Wilfred Wolf Wetzel
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ISBN:
Category : Electrons
Languages : en
Pages : 16
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