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A crossed-beam technique has been used to determine cross sections for Balmer alpha emission from hydrogen atoms excited by H + , He + and He 2+ impact within the energy range 2.5-100 keV amu -1 . Results have been compared where possible with Balmer alpha cross sections derived from theoretical predictions of cross sections for excitation of the n=3 sublevels of H.
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Donnelly et al. (1991) studied this question.
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