Measurement of Absolute Total Cross Sections for the Scattering of Electrons by He, H2, CH4 and CCl[subscript N]F[subscript M] PDF Download
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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=w150-h200)
Author: Robert K. Jones
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 246
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Book Description
![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
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 246
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Author: Brian K. Thomas
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Author: D. E. Golden
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ISBN:
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: 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: Mohammad Nasim Uddin
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Gabriel Sunshine
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Author: Paula J. Visconti
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ISBN:
Category :
Languages : en
Pages : 170
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Author: Eliasz Poss
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ISBN:
Category :
Languages : en
Pages : 190
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Author: Massoud Mahgerefteh
Publisher:
ISBN:
Category : Electron-atom collisions
Languages : en
Pages : 300
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Measurements of energy-dependent scattering cross sections for 30 to 1800 eV D incident on He, Ne, Ar, and Kr, and for 40 to 850 eV He incident on He, Ar, and Kr are presented. They are determined by using the charge-exchange efflux from the Princeton Large Torus tokamak as a source of D or He. These neutrals are passed through a gas-filled scattering cell and detected by a time-of-flight spectrometer. The cross section for scattering greater than the effective angle of the apparatus (approx. =20 mrad) is found by measuring the energy-dependent attenuation of D or He as a function of pressure in the scattering cell. The interatomic potential is extracted from the data.
