Abstract
Photoelectron energy distribution curves for polycrystalline $\ensuremath{\alpha}$-uranium show a giant Fano-type resonance for the intensity of the $5f$ valence-band features at the Fermi energy ${E}_{F}$, when the photon energy is tuned through the $5d$ core absorption edge at around $h\ensuremath{\nu}\ensuremath{\approx}94 \mathrm{to} 103$ eV. Further, a sharp (full width at half maximum = 2.2 eV) $5f$ satellite excitation at an initial energy ${E}_{i}=\ensuremath{-}2.3$ eV below ${E}_{F}$ has been observed, which has a close analogy to the "6 eV satellite" in Ni. This shakeup satellite shows also a strong resonant enhancement (\ensuremath{\ge} 6 times) at the $5d$ core-level threshold, but a distinctly different cross-section dependence. The origin of the resonances of the $5f$ main line and the 2.3-eV satellite is discussed in an atomic framework taking $5f$ and $6d$ screening into account.
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