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 2 P multiplets of 11 B and 27 Al have been remeasured by the method of atomic beams and the coupling constants A 3/2 , B 3/2 , and g J ( 2 P 3/2 ) and g J ( 2 P 1/2 ) for 11 B, and A 1/2 for 27 Al, have been redetermined to higher precision. Measurements have also been made, by the triple resonance method, of two ΔM J = 0, ΔM I = ± 1 transitions in both 11 B and 27 Al and from these the off-diagonal magnetic dipole coupling constants A 3/2 , 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.