Lifetime broadening in bulk photoemission spectroscopy

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Abstract
We establish, theoretically and experimentally, that the ‘‘anomalous’’ broadening of features in photoemission spectra close to the Fermi energy, reported by Hwu et al. [Phys. Rev. B 45, 5438 (1992)] is readily understood, by standard theory, as due to final-state broadening. Although we agree with the authors’ statement that ‘‘anomalous’’ broadening is not sufficient as evidence for non-Fermi-liquid behavior, we do not endorse the claim that their results are qualitatively similar to previous results for surface bands.