Abstract
We calculate the absorption cross section for photons by the helium 23s metastable state using the quantum–classical approximation for the total photo cross section of many-electron atoms. We note that for the 1s2s configuration of the helium 23S metastable state the photons can be absorbed by either a 1s or 2s electron. The absorption cross section of photons by the 1s and 2s electrons are predominant at high and low energies, respectively. The calculated absorption cross section for a 1s electron agrees perfectly with theoretical results. However, those of the 2s electron do not agree perfectly with experimental and theoretical results, because of the dip associated with the Cooper pair minimum at the zero crossing of the 2s hydrogenic spatial wave function. We have included in the analytical calculation, the second-order term of the Baker–Hausdorff expansion and observed a great reduction in the dip associated with the Cooper pair minimum, at low photon energy.
Published Version
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