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The hyperfine structures of the metastable (5p) 5 (6s) *P F') are: for Xe 129 , /(!<-> t) =5961.2577 (9) Mc/sec; and for Xe 131 , /(f <-> j) = 2693.6234(7) Mc/sec, /($<-»}) = 1608.3475(8) Mc/sec, and /(J <-> §) = 838.7636(4) Mc/sec. The values of the quadrupole and octupole moments of Xe 131 , without polarization corrections and without corrections for any effects of configuration mixing, are Q = -0.120(12) b and 0=+0.048(12) nmb. The hyperfine-structure anomaly for the two isotopes due to the s% electron alone is A(%) = +0.0440(44)%, in disagreement with the prediction of the single-particle model. hfs OF (5p)*(6s)*P 2 STATE OF 54 Xe 129 AND t Xe ] **> "*-!• O MEASURED Xe 10 '* + 0.169 (40) O MEASURED Hg 20, » -0.348(35) -2 FIG. 5. Octupole moments in the single-particle model for odd-neutron nuclei. g s --3.83.smaller than the value predicted by the single-particle model. The anomalies for these nuclei are the first determined for odd-neutron even-proton nuclei.

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Collision broadening studies have been made of optical double resonance lines in cadmium. The results indicate that the collision frequency is velocity dependent, contrary to the usual theory of resonance selfbroadening. This result supports the suggestion that the broadening results from interactions involving a number of intermediate states rather than only the initial and final states of the optical transition, because of the small oscillator strength (/=0.002) for transitions between the (5s) 2 ^o ground state and the excited state in question (5s5p) 3 Pi. The cross section in this case has a l/vn 2ls velocity dependence, so the collision frequency varies as Vn 315 . Measurements show that under this assumption the self-broadening cross section for cadmium is