Abstract
We demonstrate that polarization anisotropy quantum beats (QB) in two-photon ionization can be used to measure the ratio of photoionization cross sections to different angular momentum states of the photoelectron. Measurement of the ratio of photoionization cross sections has so far remained a non-trivial task by conventional photoionization techniques, including photoelectron angular distribution analysis. In this work, the amplitude of the polarization anisotropy QB for photoionization from the Na 3p 2P3/2 state was used to determine the ratio of the ionization cross sections near the ionization threshold. The experimental results are compared with theoretical predictions based on the quantum defect theory.
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