Measurements of the Syperfine Structure of Atomic Energy Levels in Co I

Abstract

Most of the Co I lines recorded by high-resolution Fourier Transform Spectrometry in the region 3000–45000 cm⁻¹ (30000–2222 Å) show significant hyperfine Structure. Computer fits to 1020 of these line profiles have yielded values of the magnetic dipole hyperfine interaction constant A for 297 energy levels with an uncertainty of between 0.2% and 3%. The A Factors range from −0.0236 to +0.0598 cm⁻¹ for the even levels, and from −0.03387 to +0.1028 cm⁻¹ for the odd levels. For 208 of these A factors no previous measurements are known. Approximate values of the electric quadrupole hyperfine interaction constant B were found for 156 levels. These measurements of A and B factors allow, for the first time, correct allowance to be made for the effects of hyperfine structure in Co I both for abundance analysis and in the resolution of blended lines.