Valence-shell single photoionization of Kr⁺ ions: Experiment and Theory

G. Hinojosa (1), A. M. Covington (1), G. A. Alna’Washi (1), M. Lu (1), R. A. Phaneuf (1), C. Cisneros (2), I. Álvarez (2), A. Aguilar (3), A. L. D. Kilcoyne (3), A. S. Schlachter (3), C. P. Ballance (4)  and  B. M. McLaughlin (5) ((1)Department of Physics, University of Nevada, Reno, NV 89557-0220 M. M. Sant’Anna Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528 – CEP, 21941-972 Rio de Janeiro RJ, Brazil; (2) Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 48-3, Cuernavaca 62210, Morelos, M´exico; (3) Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720; (4) Department of Physics, 206 Allison Laboratory, Auburn University, Auburn, AL 36849-5311; (5) Institute for Theoretical Atomic and Molecular Physics, Harvard Smithsonian Center for Astrophysics, 60 Garden Street, MS-14, Cambridge, MA 02138)

Photoionization of Kr⁺ ions was studied in the energy range from 23.3 eV to 39.0 eV at a photon energy resolution of 7.5 meV. Absolute measurements were performed by merging beams of Kr⁺ ions and of monochromatized synchrotron undulator radiation. Photoionization (PI) of this Br-like ion is characterized by multiple Rydberg series of autoionizing resonances superimposed on a direct photoionization continuum. Resonance features observed in the experimental spectra are spectroscopically assigned and their energies and quantum defects tabulated. The high-resolution cross-section measurements are benchmarked against state-of-the-art theoretical cross-section calculations from the Dirac-Coulomb R-matrix method.

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