Valence-shell photoionization of chlorinelike Ar{sup +} ions

Journal Article · Fri Jul 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.013413· OSTI ID:22051324

Covington, A M; Aguilar, A; Covington, I R; Hinojosa, G; Shirley, C A; Phaneuf, R A; Alvarez, I; Cisneros, C; Dominguez-Lopez, I; Sant'Anna, M M; Schlachter, A S; Ballance, C P; McLaughlin, B M ^[1]

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1. Department of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058 (United States)

Absolute cross-section measurements for valence-shell photoionization of Ar{sup +} ions are reported for photon energies ranging from 27.4 to 60.0 eV. The data, taken by merging beams of ions and synchrotron radiation at a photon energy resolution of 10 meV, indicate that the primary ion beam was a statistically weighted mixture of the {sup 2}P{sub 3/2}{sup o} ground state and the {sup 2}P{sub 1/2}{sup o} metastable state of Ar{sup +}. Photoionization of this Cl-like ion is characterized by multiple Rydberg series of autoionizing resonances superimposed on a direct photoionization continuum. Observed resonance line shapes indicate interference between indirect and direct photoionization channels. Resonance features are spectroscopically assigned and their energies and quantum defects are tabulated. The measurements are satisfactorily reproduced by theoretical calculations based on an intermediate coupling semirelativistic Breit-Pauli approximation.

• OSTI ID: 22051324
• Journal Information: Physical Review. A, Vol. 84, Issue 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
ARGON IONS
CROSS SECTIONS
EV RANGE 10-100
GROUND STATES
INTERMEDIATE COUPLING
ION BEAMS
METASTABLE STATES
PHOTOIONIZATION
PHOTONS
RESONANCE
RYDBERG STATES
SYNCHROTRON RADIATION