We have studied the ⌫ surface state on the Mg͑0001͒ surface by angle-resolved photoemission spectroscopy. An analysis of the temperature-dependent linewidth of this state within the Debye model yields a value of = 0.27͑2͒ for the electron-phonon coupling constant which is in good agreement with available data for bulk Mg. The electron-electron+ electron-defect scattering contribution is found by subtracting the electron-phonon contribution from the measured hole linewidth. Its value compares well with the computed result. The analysis of the role of two-and three-dimensional effects in the hole dynamics shows that interband transitions from bulk states to the hole are the dominant mechanism of the hole decay.
We have determined the electronic structure of ␣-Ga using angle-resolved photoemission from the ␣-Ga͑010͒ surface. Data were collected both at 78 K and at 273 K, i.e., below and above the temperature of the surface phase transition. We observe a number of relatively flat bands reflecting the partly covalent character of ␣-Ga. Our results agree fairly well with recent band-structure calculations.
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