Partial photoionization cross sections and angular-distribution asymmetry parameters were determined for Kr 3d photoemission using photon energies of 100 to 280 eV (to 800 eV for the asymmetry parameter). For the 3p subshell, the branching ratio relative to the 3d cross section and the asymmetry parameter were measured using energies of 280 to 800 eV. These results show good agreement with Hartree-Fock-theory predictions at all photon energies. The summed intensity of 4p~np satellites relative to the 3d main line was found to be approximately constant in the photon-energy range 180 -280 eV, and the average asymmetry parameter for these shake-up states showed a marked increase over the same energy range.

The partial cross-section and asymmetry parameters of the 2 s 1 , 2 A 1 and 2 B 2 ionic states of H 2 o+ have been measured at photon energies of 18-31 eV, by time-of-flight photoelectron spectroscopy using synchrotron radiation. The atomic character of the molecular orbitals is discussed in the interpretation of similarities and differences between the measurements for these states. Other synchrotron radiation data, resonance line measurements, and (e,2e) dipole results are ineluded. A multiple-scattering Xa (MSXa) calculation and a ground-state inversion method calculation are in good agreement with our crosssection measurements. There is excellent agreement between experimental asymmetry parameters and those computed from the MSXa method.Stieltjes-Tchebycheff imaging model calculations suggest the presence of resonant channels. This may be the origin of weak resonance structure present in the measurements.

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