Relation between $L_{2,3}$ XMCD and the magnetic ground-state properties for the early $3d$ element V

State-of-the-art x-ray magnetic circular dichroism measurements of V at the $L_{2,3}$ edges with an excellent signal-to-noise ratio are analyzed for a ${\mathrm{Fe}}_{0.9}{\mathrm{V}}_{0.1}$ disordered alloy and a ${\mathrm{F}\mathrm{e}/\mathrm{V}}_3/\mathrm{Fe}\mathrm{}\left(110\right)\mathrm{}$ trilayer which were prepared in UHV and measured in situ on a Cu(100) single crystal. The absorption fine structure and the magnetic dichroism are discussed in detail with the help of ab initio theory. Several approaches known from literature to obtain magnetic ground-state properties from experimental spectra are tested for their validity.