INVESTIGADORES
MITNIK Dario Marcelo
artículos
Título:
Electron-impact ionization of Sm12+ ions: Resonances far beyond threshold
Autor/es:
MITNIK, D. M.; GRIFFIN, D. C.; COLGAN, J.; PINDZOLA, M. S.; AICHELE, K.; ARNOLD, W.;HATHIRAMANI, D.; SCHEUERMANN, F.; SALZBORN, E.
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
The American Physical Society
Referencias:
Año: 2001 vol. 64 p. 62705 - 62725
ISSN:
1050-2947
Resumen:
Unusual resonance features at high energies were recently discovered in
the experimental crossed-beams measurements of the electron-impact
ionization of Sm12+. Theoretical calculations were able to
confirm that they are due to deep-core excitation with capture into
dielectronic states followed by sequential double Auger decay [K.
Aichele et al., Phys. Rev. Lett. 86, 620 (2001)]. In this paper
additional experimental results are presented, showing more resonances
in the single-ionization cross section. Detailed level-to-level
calculations of dielectronic capture provide a clear identification of
these resonances, as produced by a 3d-4f excitation with capture to
different nl orbitals followed by sequential emission of two electrons.
By using configuration-average distorted-wave calculations, we estimate
the branching ratios for single and double ionization by considering the
possible autoionization paths leading to resonant contributions to
excitation, single ionization, and double ionization.