Valence-shell photoionization of chlorinelike Ar${}^{+}$ ions

Valence-shell photoionization of chlorinelike Ar $^{+}$ ions

A. M. Covington, A. Aguilar, I. R. Covington, G. Hinojosa, C. A. Shirley, R. A. Phaneuf, I. Álvarez, C. Cisneros, I. Dominguez-Lopez, M. M. Sant’Anna, A. S. Schlachter, C. P. Ballance, and B. M. McLaughlin

Phys. Rev. A 84, 013413 – Published 18 July 2011

Abstract

Absolute cross-section measurements for valence-shell photoionization of Ar $^{+}$ 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 $^{2} P_{3 / 2}^{o}$ ground state and the $^{2} P_{1 / 2}^{o}$ metastable state of Ar $^{+}$ . 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.

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Received 30 April 2011

DOI:https://doi.org/10.1103/PhysRevA.84.013413

Authors & Affiliations

A. M. Covington, A. Aguilar^*, I. R. Covington, G. Hinojosa^†, C. A. Shirley, and R. A. Phaneuf

Department of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USA

I. Álvarez and C. Cisneros

Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 6-96, Cuernavaca 62131, Morelos, México

I. Dominguez-Lopez^‡, M. M. Sant’Anna^§, and A. S. Schlachter

Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA

C. P. Ballance

Department of Physics, Auburn University, Auburn, Alabama 36840, USA

B. M. McLaughlin^∥

Institute for Theoretical Atomic and Molecular Physics, Harvard Smithsonian Center for Astrophysics, 60 Garden Street, MS-14, Cambridge, Massachusetts 02138, USA

^*Present address: Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 7-100, Berkeley, California 94720, USA.
^†Present address: Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 6-96, Cuernavaca 62131, Morelos, México.
^‡Present address: Centro Nacional de Metrología, Querétaro, Qro. 76900, México.
^§Present address: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro RJ, Brazil.
^∥Present address: Centre for Theoretical Atomic, Molecular and Optical Physics (CTAMOP), School of Mathematics and Physics, The David Bates Building, 7 College Park, Queen’s University of Belfast, Belfast BT7 1NN, United Kingdom.

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Vol. 84, Iss. 1 — July 2011

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