Photoionization and electron-impact ionization of Kr5+

Authors

M. Lu, University of Nevada - RenoFollow
M. F. Gharaibeh, University of Nevada - Reno
G. Alna’washi, University of Nevada - Reno
R. A. Phaneuf, University of Nevada - RenoFollow
A. L. D. Kilcoyne, Lawrence Berkeley National LaboratoryFollow
E. Levenson, Lawrence Berkeley National Laboratory
A. S. Schlachter, Lawrence Berkeley National LaboratoryFollow
A. M. Müller, Institut für Atom-und Molekülphysik
S. Schippers, Institut für Atom-und Molekülphysik
J. Jacobi, Institut für Atom-und Molekülphysik
S. W. J. Scully, Queen’s University
C. Cisneros, Universidad Nacional Autonoma de MexicoFollow

Date of this Version

2006

Citation

Physical Review A 74, 012703 (2006); DOI: 10.1103/PhysRevA.74.012703

Abstract

Absolute photoionization cross sections for Kr⁵⁺ were measured in the photon energy range 74–175 eV using synchrotron radiation. For comparison, a detailed energy scan of the electron-impact ionization cross section was made in the same energy range and normalized to previously published absolute measurements. The Flexible Atomic Code and Cowan atomic structure code were used to calculate energy levels, excitation energies, and oscillator strengths for 3d→np, 3d→nf, and 4s→np autoionizing transitions from the ground and metastable states. Within the experimental uncertainty, oscillator strengths determined from the photoionization measurements are in agreement with both calculations. Excitation-autoionization and resonant excitation-double-autoionization features are evident in the electron-impact ionization cross section.