Diagonal and Off-Diagonal Hyperfine Structure in the Ground Multiplets of Boron and Aluminum by the Atomic Beam Method; Magnetic Dipole Radial Parameters

Abstract

The magnetic resonance spectra of the ground 2P multiplets of 11B and 27Al have been remeasured by the method of atomic beams and the coupling constants A3/2, B3/2, and gJ(2P3/2) and gJ(2P1/2) for 11B, and A1/2 for 27Al, have been redetermined to higher precision. Measurements have also been made, by the triple resonance method, of two ΔMJ = 0, ΔMI = ± 1 transitions in both 11B and27 Al and from these the off-diagonal magnetic dipole coupling constants A3/2,1/2 have been determined.These measurements have enabled us to evaluate the magnetic dipole radial parameters [Formula: see text], [Formula: see text], and [Formula: see text] for both boron and aluminum. The departures of [Formula: see text] and the ratio [Formula: see text] from their restricted Hartree–Fock values are plotted as functions of the occupation number N for all elements with (2p)N and (3p)N ground configuration for which data are available. The trends are briefly discussed.

Large-scale multiconfiguration Hartree-Fock calculations of hyperfine-interaction constants for low-lying states in beryllium, boron, and carbon

“…Relativistic and finite-nuclear-size corrections were made using scaled corrections from Li( P). [25,26] [27] [3,4] 'Relativistic and finite-nuclear-size corrected using scaled corrections from Li{ P).…”

Coupled-cluster calculations of properties of the boron atom as a monovalent system

“…The corrections made to each HFS constant by the dressing, scaling, and extrapolation procedures follow the CCSDvT3 approximation's result. Our final results, the MCHF method's A constants [38] as well as experimental results [39] are shown at the bottom of To reiterate, we examined the application of various coupled-cluster approximations for atomic boron. We treated the trivalent boron atom as a monovalent system, taking into account that the 2p valence electron is often the excited electron in optical transitions.…”

Full configuration interaction and multiconfigurational spin density in boron and carbon atoms

“…Table II contains total energies and spin densities for boron; Table III presents the same data for carbon. The best available experimental spin densities are 0.0081 for boron 24 and 0.0173 for carbon. 25 Our choice of Chipman's Gaussian basis sets for this study was prompted by the illustration 18,26 that these basis sets are capable of providing a reasonably good description of Fermi contact spin densities.…”