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An electron transmission experiment is used to study the resonances in the total scattering cross section of atomic hydrogen below the threshold of the first excited state. The three lowest resonances, designated ¹S, ³P, and ¹D, are observed and their energies and decay widths are found to be in good agreement with the values predicted theoretically using close coupling with correlation.
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Sanche et al. (1972) studied this question.
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