Asymmetric profiles observed in the recombination of Bi⁷⁹⁺: A benchmark for relativistic theories involving interference

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Nobuyuki Nakamura,¹ Anthony P. Kavanagh,² Hirofumi Watanabe,³ Hiroyuki A. Sakaue,⁴ Yueming Li,⁵ Daiji Kato,⁴ Fred J. Currell,² Xiao-Min Tong,^6,7 Tsutomu Watanabe,¹ and Shunsuke Ohtani¹
¹Institute for Laser Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
²Queen's University Belfast, Belfast BT7 1NN, United Kingdom
³Chubu University, Kasugai-shi, Aichi 487-8501, Japan
⁴National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
⁵Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
⁶Doctoral Program in Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
⁷Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

Received 19 March 2009; published 31 July 2009

Asymmetricprofiles have been observed in the recombination cross section ofBe-like Bi obtained by measuring the electron energy dependence ofthe ion abundance ratio in an electron-beam ion trap. Incontrast to the previous x-ray measurements, the present measurement givesthe integrated recombination cross section with higher statistical quality, whichprovides a benchmark to test the relativistic theory involving theinterference between the resonant and continuum states. The comparison withour theoretical study shows that the Breit interaction plays animportant role in this case.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.80.014503
DOI:	10.1103/PhysRevA.80.014503
PACS:	31.15.am; 34.80.Lx; 34.10.+x; 52.20.Fs 31.15.am Ab initio relativistic configuration interaction (CI) and many-body perturbation calculations (atoms and molecules) 34.80.Lx Recombination and attachment in electron/positron scattering of atoms and molecules; positronium formation 34.10.+x General theories and models of atomic and molecular collisions and interactions 52.20.Fs Electron collisions in plasma YEAR: 2009
KEYWORDS:	bismuth, ion recombination, particle traps, positive ions, relativistic corrections, resonant states

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