We present results of high resolution photoelectron spectrometry measurements for the ͑2s͒ relative partial photoionization cross section between the 2p and 3p ionization thresholds in atomic beryllium. This includes the 3snp autoionizing resonance series converging to the 3s threshold, the 3pns, nd series converging to the 3p threshold, and several members of the 3dnp, nf series. The results for the perturbed 3snp series are compared with the ion yield results that give the total photoionization cross section. We found very good agreement with calculations for the 2s partial cross section both in the R-matrix approximation and a hyperspherical calculation. We confirm the perturbation of the series by the 3p4s interloper with a resonance profile that is the same as for the total cross section. We did not find evidence of a second interloper ͑3d4p͒ between the 3s10p and 3s11p resonances. We also find very good agreement between experiment and theory for the Shore parameters of these resonances. The data for the resonances between the 3s and 3p thresholds are compared with the results of a R-matrix 2s cross section calculation. Good agreement is found for the energy positions and overall resonance shapes once the calculated energies are referred to the experimental 3p threshold.
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