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Partial photoionization cross sections and photoelectron angular distributions of He in the region of interfering Rydberg series below the n0ex0ex=0ex0ex5 threshold are measured and compared with theoretical results based on the hyperspherical close-coupling method. At a bandpass of 12meV for the photon energy, this level of differentiation offers the most critical assessment of the dynamics of the two-electron excitations to date. A good understanding is achieved.
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Menzel et al. (1995) studied this question.
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