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Physics Letters A

Two photon ionization of the levels of potassium with linear and circular polarization

Pierre Agostini, P. Bensoussan, M. Movssessian

Published May 1, 1975• 7 citations
Publisher
DOI
10.1016/0375-9601(75)90359-x

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The intensity and polarization dependence of the ion production due to three quantum ionization was investigated in potassium. The energy of two of the photons was tuned into resonance with n 2 D levels for 4 < n < 22. The ratio of the ion signals produced with circular polarization to that found with linear polarization was significantly less than that predicted by a single rate approximation. The discrepancy is explained by the increased linewidth of the resonant 2 D level due to the ionization process itself. Single quantum photoionization cross sections for the excited levels calculated by means of quantum defect theory are shown to be consistent with the experimental results.