The optical technique of reflection anisotropy spectroscopy was used to study the Cu(110)-(1 x 2) surface reconstruction induced by Na adsorption. Room temperature deposition of sub-monolayer coverages of Na onto the Cu(110) surface resulted in the (1 x 2) reconstruction and was known to induce energy shifts in both the occupied and unoccupied surface states at the Y̅ point on Cu(110). Transitions between these surface states were associated with a peak observed at 2.1eV in the reflection anisotropy spectrum. Reflection anisotropy spectroscopic studies were report for the reconstruction and relate changes in the reflection anisotropy spectra at 2.1eV to changes in the surface states induced by Na adsorption.

Reflection Anisotropy Spectroscopy of the Na/Cu(110)(1 x 2) Surface Reconstruction. D.S.Martin, A.M.Davarpanah, S.D.Barrett, P.Weightman: Physical Review B, 2000, 62, 15417-9