Hyperfine Structure of the Spectrum of Zr I and the Magnetic Moment of Zr91

The hfs of the spectrum of Zr I was investigated, natural zirconium sample being used; and in some lines the hfs of Zr 91 was observed. The magnetic moment of Zr 91 calculated from the measured splittings in the line λ4687.80 (4 d 3 5 s 5 F 5 -4 d 3 5 p 5 G 6 ) and other lines is \begin{aligned} \mu (\text{Zr}^{91}){=}-1.3{\pm}0.3\ \text{nm}.. \end{aligned}