Recommended electron-impact excitation and ionization cross sections for Be I
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Das, T
Bartschat, K
Bray, I
Fursa, DV
Zatsarinny, O
Ballance, C
Chung, H-K
Ralchenko, Yu
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Abstract
Analytic fits to the recommended electron-impact excitation and ionization cross sections for Be I are presented. The lowest 19 terms of configurations 2s nl (n </ 4) and 2p2 terms below the first ionization limit are considered. The fits are based on the accurate calculations with the convergent close coupling (CCC) method as well as the B-spline R-matrix (BSR) approach. The fitted cross sections provide rate coefficients that are believed to approximate the original data within 10% with very few exceptions. The oscillator strengths for the dipole-allowed transitions between all the considered states are calculated with the relativistic multi-configuration Dirac–Hartree–Fock (MCDHF) approach and compared with the CCC and BSR results. This comparison shows a very good agreement except for a handful of cases with likely strong cancellations.
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ATOMIC DATA AND NUCLEAR DATA TABLES
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127
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Atomic, molecular and optical physics