Correlation effects in Xe^+ photoionization
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A new spectroscopic technique, giving complete two-dimensional e(-)-e(-) coincidence spectra in single photon double photoionization, is presented. The technique resolves the states of doubly charged ions and provides spectra of the individual electrons emitted in formation of each final dication state. Complete spectra for double photoionization of Xe, Kr, and Ar at photon energies up to 51 eV have been recorded. Overall and surprisingly, the np(4) 3P, 1D, and 1S states are populated according to their statistical weights. When the evident autoionization is excluded, the supposedly favored 3P states are in fact disfavored. Detailed information on the autoionization processes is also made available.
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We report Breit-Pauli and Dirac R-matrix cross sections for the photoionization of endofullerene Xe@C60, showing strong confinement resonances, in excellent agreement with a recent experiment.
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Radiative lifetimes of 14 levels of Xe i and 16 levels of Xe ii have been measured by use of an electron-impact method and single-photon counting. Results are compared with other experimental data and with calculations performed in the Coulomb approximation, assuming j1k coupling for the Xe i levels and L S coupling for the Xe ii levels.
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