ABSTRACT
Unoccupied energy bands of iron are mapped by inverse photoemission from Fe(100), Fe(110), and Fe(111). The ferromagnetic exchange splitting δEex of the uppermost d band is measured for the H′25 point, where the minority- and majority-spin subbands are both empty (δEex =1.8 eV with H′25↓ at 1.9 eV and H′25↑ at 0.12 eV above EF ). Several other critical points are determined, such as the minority-spin Γ12 and P3 points, the majority-spin N3 point, and the higher-lying H15 ,H1 points of s,pcharacter. Critical points and exchange splitting are compared with first-principles, local-density calculations. The real part of the self-energy is obtained from this comparison, and the imaginary part by measuring the liftime broadening. In the d-band region, the self-energy causes a 10% compression of the bands and a linear broadening Γ(E)≈0.6|E-EF |.
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