Hyperfine Structure Constants of Sc i and Sc ii with Fourier Transform Spectroscopy

Abstract We report new experimental hyperfine structure (HFS) constants of neutral and singly ionized scandium (Sc i Sc ii ). observed spectra Sc–Ar Sc–Ne hollow cathode discharges in the region 200–2500 nm (50,000–4000 cm −1 ) using Fourier transform spectrometers. The measurements show significant HFS patterns 1431 spectral lines fitted our 12 given Table 1. These were computer package Xgremlin to determine magnetic dipole interaction constant (A) for 185 levels 6 , which 80 had no previous measurements. uncertainty A is between 1 × 10 −4 5 .