Abstract
Recent experimental measurements and calculated photoabsorption cross sections for helium encompassing the discrete spectrum and continuum are tested by the sum rules S(p), p = -2, -1, 0, +1, +2. The agreement is excellent for S(-2), but degrades monotonically toward S(+2). For the latter, calculated cross sections are shown to be distinctly superior to recent experimentally derived values. The comparison of cross sections with sum rule values suggests that higher-order corrections to the latter may be useful.
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