One-dimensional surface states (chain states) on a metal surface: H on Ni(110)

H adsorption on Ni(110) at sample temperatures ${\mathit{T}}_{\mathit{S}}$>200 K is known to result in a one-dimensionally disordered surface exhibiting a missing/added row reconstruction with irregular row-to-row spacing but long range periodicity along the rows. Inverse photoemission shows an unoccupied surface state with wave vector perpendicular to the rows being completely quenched due to the one-dimensional disorder. In contrast, an unoccupied surface state propagating along the rows is not attenuated at all. This indicates that the latter is a one-dimensional chain state, localized to individual atom rows.