Abstract
We report a high-resolution study of the ‘Shockley-type’ occupied surface state residing in the projected L 2′–L 1 gap around the Ȳ point of the surface Brillouin zone. Along ΓY on Ag(110) this band shows a parabolic dispersion with k ‖, the surface wave vector. The effective mass is m ∗/ m=0.26±0.02 and the bottom of the parabola at Ȳ shows a linear dependence on sample temperature according to E 0=−(106±5)meV+(0.17±0.01 meV/K) T. In consequence, the surface band gets empty above T=624±37 K. These numbers give a quantitative interpretation of strong temperature effects observed earlier by other authors in second-harmonic spectra from Ag(110), where the fundamental light couples the occupied surface state to an unoccupied surface state within the same projected gap. From our data we derive a more precise value of its bottom energy E f=1.66±0.02 eV above E F at Ȳ.
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