MAPON SPECTROSCOPY AND ITS APPLICATION TO TRANSITION-METAL FERROMAGNETS

Modulated adiabatic passage on oriented nuclei (MAPON) is a technique developed specifically to measure very small electric quadrupole inter actions (EQIs) at radioactive probe nuclei even when such interactions are masked in the frequency domain by inhomogeneous magnetic broadeni ng associated with a dominant magnetic hyperfine interaction. In this paper an overview of the technique is presented with particular refere nce to (CoCo)-Co-60 EQI measurements which were an important step in e stablishing MAPON methodology. MAPON results for dilute nd impurities in ferromagnetic Fe and Ni metal hosts are reviewed including presenta tion of new data for (CoNi)-Co-58 and (CoNi)-Co-60. Priorities for fut ure studies are provided on the basis of this review.