Abstract
A Fourier-Transform-Ion-Cyclotron-Resonance mass spectrometer has been installed at the BESSY II storage ring. This unique setup enables to record soft X-ray absorption and magnetic circular dichroism spectra (XMCD) of mass-selected clusters in the photon energy range 200–1200 eV. The photoabsorption signal is obtained by recording the fragmentation pattern as produced after X-ray absorption and subsequent Auger decay of the core-excited parent cluster ion. The experimental setup and first X-ray absorption spectra on V 13 + and Nb 13 + are discussed. The feasibility of recording X-ray induced XMCD spectra is demonstrated for Co 22 +. Improvements that allow for quantitative determination of spin and orbital momenta in the future are briefly outlined.
Published Version
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