Zeeman Effect in the Arc Spectrum of Cobalt

Zeeman patterns for 151 lines in the range λ3200 to λ6500 are measured and g-factors for 100 terms are determined. All the experimental g-factors are compared with their theoretical values for LS coupling and those for the deep even terms are compared with theoretical values for intermediate coupling. The experimental values for the multiplets, b⁴P, a²D, m²D^∘, y⁴F^∘ and m²P^∘ deviate rather widely from the theoretical values. The Zeeman patterns indicate changes in classifications for λ4549.67 and λ6450.24 and decide the quantum numbers for two incompletely analyzed terms.