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1990•Japanese Journal of Applied PhysicsOpen access

A Useful Method for the Determination of the Total Electron Scattering Cross Section

Hiroyuki Nishimura, Takeji Sakae

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Abstract

A compact linear electron transmission apparatus has been constructed for the measurement of the total electron-scattering cross section for various atoms and molecules. The transmitted electrons are analyzed without a retarding potential. The effective scattering path length of electrons in the apparatus can be evaluated from measured currents. As a test of this method, the total electron-scattering cross section for CH4 has been measured in the energy range between 5 and 500 eV with a statistical uncertainty ≤5% for electrons below 250 eV and ≤7% for electrons above 250 eV. The results show E -1/2 dependence at lower energies and a steeper decline at higher energies.

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A compact linear electron transmission apparatus has been constructed for the measurement of the total electron-scattering cross section for various atoms and molecules. The transmitted electrons are analyzed without a retarding potential. The effective scattering path length of electrons in the apparatus can be evaluated from measured currents. As a test of this method, the total electron-scattering cross section for CH4 has been measured in the energy range between 5 and 500 eV with a statistical uncertainty ≤5% for electrons below 250 eV and ≤7% for electrons above 250 eV. The results show E -1/2 dependence at lower energies and a steeper decline at higher energies.

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Available abstract

A compact linear electron transmission apparatus has been constructed for the measurement of the total electron-scattering cross section for various atoms and molecules. The transmitted electrons are analyzed without a retarding potential. The effective scattering path length of electrons in the apparatus can be evaluated from measured currents. As a test of this method, the total electron-scattering cross section for CH4 has been measured in the energy range between 5 and 500 eV with a statistical uncertainty ≤5% for electrons below 250 eV and ≤7% for electrons above 250 eV. The results show E -1/2 dependence at lower energies and a steeper decline at higher energies.

Key concepts: Electron, Scattering, Atomic physics, Cross section (physics), Electron scattering, Range (aeronautics), Mean free path, Path length

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