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- W2022376949 abstract "An atom beam recoil technique has been used to determine the total, $Q$, differential, $ensuremath{sigma}(ensuremath{theta})$, and differential exchange, ${ensuremath{sigma}}_{e}(ensuremath{theta})$, cross sections for the scattering of low-energy electrons by potassium. The method consists of observing the angular distribution of atoms scattered from a potassium atom beam which has been cross fired by an electron beam. Relative values of $ensuremath{sigma}(ensuremath{theta})$ are then obtained by transforming to electron scattering angles. An inhomogeneous magnet and collimating channel are used as a velocity filter for the atom beam. Curves representing the variation of $ensuremath{sigma}(ensuremath{theta})$ with $ensuremath{theta}$ between approximately 15ifmmode^circelsetextdegreefi{} and 60ifmmode^circelsetextdegreefi{} are presented for various electron energies between 0.6 and 9.0 ev.The magnet also serves to polarize the beam. Relative values of ${ensuremath{sigma}}_{e}(ensuremath{theta})$ were determined by observing the amount of depolarization of the beam in the scattering region, using a second inhomogeneous magnet as an analyzer. Over the observed range of angles, exchange accounts for approximately one third of the scattering. Bounds on the total exchange cross section, ${Q}_{e}$, are also tabulated for energies between 0.5 and 4.0 ev. The bounds on ${Q}_{e}$ at 0.5 volt are $0.8ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}14} {mathrm{cm}}^{2}<{Q}_{e}<1.6ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}14} {mathrm{cm}}^{2}$." @default.
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- W2022376949 date "1960-01-01" @default.
- W2022376949 modified "2023-09-23" @default.
- W2022376949 title "Measurement of the Total, Differential, and Exchange Cross Sections for the Scattering of Low-Energy Electrons by Potassium" @default.
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- W2022376949 doi "https://doi.org/10.1103/physrev.117.151" @default.
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