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- W2015814897 abstract "Experiments show that a beam of electrons tends to trap or guide neutral molecules so their motion is preferentially parallel or antiparallel to that of the electrons. In one apparatus the beam of electrons is coaxial with a molecular beam. When the latter is KC1, the presence of the electrons increases the flux of molecules to the surface ionization detector by a factor of up to 103 over that obtained in the absence of the electrons. In another apparatus a beam of electrons in one chamber can direct molecules of the residual gas through a slit into another chamber where the detector is a mass spectrometer. The trapping effect is most marked when the number of molecules is small, as it is for weak molecular beams (fluxes less than 107 molecule cm−2s−1 for thermal beams) or when the residual gas is at a low pressure (<10−4Pa). A model based on the cumulative effect of many successive collisions of electrons with a molecule in the field of the beam of electrons provides a semi-quantitative interpretation of the measurements." @default.
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- W2015814897 date "1980-08-01" @default.
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- W2015814897 title "Control of the motion of neutral molecules by a beam of electrons" @default.
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- W2015814897 doi "https://doi.org/10.1063/1.440231" @default.
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