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Measurements of relative electron-impact excitation functions for production of the metastable 21S and 23S states of helium in the range 25–135 eV have been made by observing the deflection of a beam of excited atoms in an inhomogeneous magnetic field. Effects of imprisonment and scattering of the beam have been eliminated by extrapolating the data to zero pressure, and the effect of photons in the beam separately determined. The ratio of the singlet to triplet functions obtained (including cascade contributions) varies from 0.26 to 2.37 in the energy range studied.
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Dugan et al. (1967) studied this question.
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