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- W2002429713 abstract "Abstract The 4 He + beam from a Van de Graaff accelerator is often accompanied by an 16 O + beam of the same energy. If, after acceleration and before magnetic analysis, one electron is stripped from the oxygen ion to form 16 O 2+ , these ions will not be separated from 4 He + during magnetic analysis. The 16 O 2+ fraction in the 4 He + beam was measured by analyzing back-scattering spectra for a thin Au film and the O to He ion charge ratio of 2:1 was confirmed by electrostatic deflection. Ion source conditions and the pressure in the beam lines strongly affect the 16 O 2+ fraction and the dependence of the O 2+ /O + ratio on pressure is found to be in approximate agreement with predicted values. A formula for estimating the 16 O 2+ beam intensity, based on charge exchange data and measurement of the primary 16 O + beam intensity, is N [ O 2+ ] = 13 P ( torr ) l ( cm ) N [ O + ], where P is the total gas pressure, l the length of the beam line between the accelerator and switching magnet and N [O 2+ ] and N [O + ] are the beam intensities of the respective species. The 16 O 2+ contamination of 4 He + beams is easily removed by electrostatic separation." @default.
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- W2002429713 date "1973-12-01" @default.
- W2002429713 modified "2023-09-27" @default.
- W2002429713 title "16O contamination in 4He analysis beams" @default.
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- W2002429713 doi "https://doi.org/10.1016/0040-6090(73)90073-4" @default.
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