Additions to the Spectrum and Energy Levels and a Critical Compilation of Singly-Ionized Boron, B II

Abstract

We have undertaken a number of experimental studies of the structure of singly ionized boron, B II. Much of this work was initially motivated by a search for the "missing" 2s3s 1 S term. There was a surprising disagreement between theory and experiment for this level. In this context lots of data for B II were collected over the years, from beam-foil experiments, high-resolution spark spectroscopy and theoretical calculations. The new material, which includes more than 80 newly classified (or revised) spectral lines, has now been thoroughly analyzed. This was followed by a critical compilation of all known levels and lines of B II, along with the theoretical interpretation of the levels, classifications of the lines and calculated transition probabilities for most lines. C Physica Scripta 2005 Physica Scripta 71 A. N. Ryabtsev et al. 3. The beam-foil experiment of 1999 and some earlier unpublished beam-foil studies

Effect of an external magnetic field on the determination of E1M1 two-photon decay rates in Be-like ions

“…Details of results connected to the particular experiment suggested at ESR are presented in Sec. V D. [46] and theoretical rates [48] from the NIST database [47] for Z = 5. Results for ions of charge states Z = 50 and 92 are compared with another recent accurate theoretical work [17] (labeled BSRCI).…”

K-shell photoionization of Be-like boron (B+) ions: experiment and theory

“…j Saddle-point-method (SPM) [54,55]. k Inferred from existing experiments employing theoretical modelling [47]. l Complex scaling, multi-reference configuration interaction (MR-CI) [59].…”

“…j Complex scaling, multi-reference configuration interaction (MR-CI) [59]. k Inferred from existing experiments employing theoretical modeling [47].…”

Division Xii / Commission 14 / Working Group Atomic Data

“…The following compilations on wavelengths and energy levels have been published by the Atomic Spectroscopy group at NIST: Be ii [124] In addition to these comprehensive compilations, the Handbook of basic atomic spectroscopic data [218] contains a selection of the strongest spectral lines of neutral and singly-ionized atoms of all elements from hydrogen to einsteinium. Compilations by other groups include He I [69,169], B II [201], and a compilation of coronal lines [76].…”