Hyperfine structure and gJ value of the D322 and of the F924 states of Au197

The hyperfine structure (hfs) and gJ value of the metastable (5d96s2) D322 and of the (5d96s6p) F924 levels in Au197 have been measured by the atomic-beam magnetic-resonance method. The results for the hfs interaction constants, which have been corrected for second-order interactions with neighboring fine-structure levels, are A(D322)=199.8425(2) Mc/sec, B(D322)=-911.0766(5) Mc/sec, C(D322)=0.000212(14) Mc/sec, A(F924)=432.276(1) Mc/sec, B(F924)=-540.026(17) Mc/sec, and C(F924)=0.00326(10) Mc/sec. A detailed interpretation of these measurements together with those of Goodman and Childs on the (5d96s2) D522 level yields a value for the quadrupole moment of Q=0.594(10) b without the Sternheimer correction. We are not able to obtain a consistent value for the octupole moment. From the Zeeman effect of the hfs we find gJ(D322)=0.799(1) and gJ(F924)=1.334(2). © 1967 The American Physical Society.