K-shell photoionization of ground-state Li-like boron ions B^{2+}: Experiment and Theory

A. Müller (1), S. Schippers (1), R. A. Phaneuf (2), S. W. J. Scully (2,3), A. Aguilar (2,4), C. Cisneros (5), M. F. Gharaibeh (2), A. S. Schlachter (4), B. M. McLaughlin (3,6) ((1)  Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, Giessen, Germany; (2) Department of Physics, University of Nevada, Reno, Nevada, USA; (3) Centre for Theoretical Atomic, Molecular and Optical Physics (CTAMOP), School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK;
(4) Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA; (5)Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Mexico; (6) Institute for 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 boron [B^{2+}(1s^2.2s ^2S)] ions were measured by employing the ion-photon merged-beams technique at the Advanced Light Source synchrotron radiation facility. The energy ranges 197.5-200.5 eV, 201.9-202.1 eV of the [1s(2s.2p) ^3P] ^2P^o and [1s(2s.2p) ^1P] ^2P^o resonances, respectively, were investigated using resolving powers of up to 17600. The energy range of the experiments was extended to about 238.2 eV yielding energies of the most prominent [1s(2l.nl’)] ^2P^o resonances with an absolute accuracy of the order of 130 ppm. The natural linewidths of the [1s(2s.2p) ^3P] ^2P^o and [1s(2s.2p) ^1P] ^2P^o resonances were measured to be 4.8 ± 0.6 meV and 29.7 ± 2.5 meV, respectively, which compare favourably with theoretical results of 4.40 meV and 30.53 meV determined using an intermediate coupling R-matrix method.

Complete preprint ==> http://arxiv.org/abs/1203.5375

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