Using laser-induced nuclear-orientation and optical-saturation techniques, we have produced sub-Doppler changes in the anisotropy of the angular distribution of the 514-keV y rays from the 1-^us isomer 85 Rb w . This permits high-resolution measurements of D\ and D2 hyperfine transitions of atoms of the isomer, which give the isomer's nuclear electric quadrupole moment, -0.73 ±0.17 b, and its nuclear magnetic dipole moment, (6.043 ±0.005)HN. The isomer shift, -113 ±8 MHz relative to the ground state of 85 Rb, corresponds to a change in the mean-square charge radius of +0.174 ±0.008 fm 2 .
A new technique for overcoming inhomogeneous broadening in condensed matter is reported. Phase-matchinginduced frequency selectivity associated with multiresonant four-wave mixing is explored in detail for the first time to our knowledge and shown to give laser-limited linewidths that are more than 10 times narrower than the inhomogeneous width of an intermediate resonance in LiTbF (4). The anomalous dispersion associated with the resonance. was also measured, and model calculations suggest that significantly greater narrowing is feasible.
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