Absolute elastic differential cross sections of atomic hydrogen have been measured by a modulated crossed-beam method. The energy and angular range covered were from 5 to 30 eV and from 12^∘{} to 156^∘{}, respectively. The present results agree with the previous measurements within the experimental uncertainty below 15 eV, but it is found that the present results show stronger backward scattering (>120^∘{}) than the previous measurement and theoretical results by more than a factor of 2 above 20 eV.
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Shyn et al. (1989) studied this question.
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