Electron capture spectroscopy (ECS) measures the surface electron spin polarization (ESP) by passing a deuteron ion beam very close to and grazing an atomically flat sample. Polarized electrons that are captured polarize the deuterons by the hyperfine interaction. The polarization of the deuterons is measured by the asymmetry of scattered alpha particles resulting from the nuclear reaction D(T,n)$\alpha$. On the proposed, half-metallic, half-semiconducting, ferromagnetic material, NiMnSb, electron capture spectroscopy measures a surface electron spin polarization (ESP) of +13%, establishing unambiguously that long-range, surface ferromagnetic order exists for this ternary alloy.

There has been a considerable amount of investigation, both theoretical and experimental, of how spin systems behave in magnetic resonance when the applied dc field and the rf oscillating field have comparable amplitudes. A technique called Double Electron Muon Resonance has recently been applied to fused quartz at low frequency enabling us to see directly how the spin precesses in perpendicular dc and rf magnetic fields of comparable strength. The precessional frequency spectra are in excellent agreement with predictions by numerical integration of the equations describing spin precession. Among the effects observed have been harmonic responses, Bloch-Siegert shifts and multi-quantum transitions.

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