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In this letter it is shown that high resolution Fe Kβ excitation spectra can be used to separately probe empty spin-up and spin-down final states. Spin-selective x-ray absorption spectra were obtained by selectively monitoring different regions of the Kβ emission. The fluorescence was excited with monochromatized synchrotron radiation and analyzed using a spherically bent Ge(620) crystal. Spin–polarization was demonstrated by showing that the 1s→3d transition at the Fe K edge is seen with Kβ1,3 detection, but missing in the excitation spectrum using Kβ′ detection. The spin–polarization is also confirmed by ligand field atomic multiplet calculations that reproduce the Kβ spectra. Calculations are presented showing the applicability of spin–polarized Kβ detection to nearly all first transition metal ions.

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The usefulness of heavy-ion forWard scattering coincidence measurements is demonstrated for the detection of low-mass impurity atoms in thin self-supporting nickel and gold films. Oxygen beams of 15-20 MeV have been used to detect 16 0 and 24Mg atoms in nickel films :::;200 J-tg cm-2 thick and chlorine beams of 40 Me V to detect 39K and 63CU atoms in gold films :::; 350 J-tg cm -2 thick. The detection sensitivity and mass discrimination are functions of the angle of acceptance of the detectors. Impurity atom concentrations of the order 10 14 atoms cm-2 are detectable. Depth information is available from the energy spectra. Possible application of the detection technique to the determination of the lattice site of low-mass impurities, by channeling in thin single crystals, is considered.[This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 193.0.65.67 On: Wed, 03 Dec 2014 15:50:22

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