The hyperfine interaction of xenon atoms (${}_{}{}^{129m}{}_{}{}^{}\mathrm{Xe}$) implanted in iron has been studied with nuclear magnetic resonance on oriented nuclei. A sharp resonance line was found at ${\nu }_1=188.12\mathrm{}\pm 0.02$ MHz for substitutionally implanted atoms. In addition a broad resonance line corresponding to vacancy-associated xenon atoms was detected at ${\nu }_2=152.0\mathrm{}\pm 0.6$ MHz. By measuring ${\nu }_1$ for different external fields, the nuclear $g$ factor of the $I^{\pi }={\frac{11}{2}}^{-}$ state ($g=0.154\mathrm{}\pm 0.005$), as well as the values and the sign of the internal fields, was determined.

• Received 27 April 1976

DOI:https://doi.org/10.1103/PhysRevLett.37.302