Abstract
The ionization cross section of hydrogen atom from the metastable 2s state has been calculated in the energy range 5.0--30 eV by using different approximations. The distorted-wave Born approximation has been obtained by solving the static-plus-exchange equation. The present results obtained using the double-Coulomb approximation (in which both the scattered and the ejected electrons are considered to be a Coulomb function with unit charge) are more reliable and are in better agreement with the measured values than other theoretical predictions above 15 eV.
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