Complex structure in photoemission spectra of Be(0001) surface states near the Fermi energy is observed and explained as the effect of strong electron-phonon coupling. The weak momentum dependence of the electron-phonon contribution to the electron self energy Σ is exploited to determine Σ by direct inversion of the spectra.

• Received 28 May 1999

DOI:https://doi.org/10.1103/PhysRevB.61.2371