K-shell photoionization of ground-state Li-like carbon ions C^{3+}: experiment, theory and comparison with time-reversed photorecombination

A. Müller (1), S. Schippers (1), R. A. Phaneuf (2), S. W.  J. Scully (2,3), A.
Aguilar (2,4), A. M. Covington (2), I. Álvarez (5), C. Cisneros (5), E. D.
Emmons (2), M. F. Gharaibeh (2), G. Hinojosa (5), A. S. Schlachter (4), B. M McLaughlin (3,6) ((1)Institut für Atom-und Molekülphysik, Justus-Liebig-Universität Giessen, Germany (2) Department of Physics, University of Nevada, Reno, Nevada, USA
(3) School of Mathematics and Physics, The David Bates Building, Queen’s University Belfast, UK (4) Lawrence Berkeley National Laboratory, Berkeley, California, USA (5) Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Mexico (6) Institute of Theoretical Atomic and Molecular Physics, Harvard Smithsonian
Center for Astrophysics, Cambridge, Massachusetts, USA)

Absolute cross sections for the K-shell photoionization of ground-state Li-like carbon [C^{3+}(1s^2 2s ^2S)] ions were measured by employing the ion-photon merged-beams technique at the Advanced Light Source. The energy ranges 299.8-300.15 eV, 303.29-303.58 eV and 335.61-337.57 eV of the [1s(2s.2p) ^3P] ^2P, [1s(2s.2p) ^1P] ^2P and [(1s.2s) ^3S 3p] ^2P resonances, respectively, were investigated using resolving powers of up to 6000. The autoionization linewidth of the [1s(2s.2p) ^1P]^2P resonance was measured to be 27 ± 5 meV and compares favourably with a theoretical result of 26 meV obtained from the intermediate coupling R-Matrix method. The present photoionization cross section results are compared with the outcome from photorecombination measurements by employing the principle of detailed balance.

Complete preprint ==> http://arxiv.org/pdf/1203.5441v1.pdf

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