A SEMI-THEORETICAL CALCULATION OF 3S3P FINE-STRUCTURE SPLITTINGS IN MGI USING ASYMPTOTIC VALUE OF QUANTUM-DEFECT FOR 3SNP ORBITS

Energy separations between fine-structure levels of the metastable 3s3 p 3P term of neutral magnesium have been calculated making use of asym ptotic value of quantum defect for the 3snp orbits. Lande interval ano malies expressed as ratio L(a) = 3(P-3(0)-P-3(1))/(P-3(0)-P-3(2)) obta ined from the available experimental data along the isoelectronic sequ ence have been fitted to be well represented by a series in ascending powers of the atomic number Z of the species concerned. The results so obtained are compared with the high-resolution measurements: they agr ee at the level of 200 MHz which lies well inside the estimated uncert ainty bar of +/- 1.1 GHz of our calculations.