ONE-DIMENSIONAL SURFACE-STATES (CHAIN STATES) ON A METAL-SURFACE - H ON NI(110)

H adsorption on Ni(110) at sample temperatures T(S) > 200 K is known t o result in a one-dimensionally disordered surface exhibiting a missin g/added row reconstruction with irregular row-to-row spacing but long range periodicity along the rows. Inverse photoemission shows an unocc upied surface state with wave vector perpendicular to the rows being c ompletely quenched due to the one-dimensional disorder. In contrast, a n unoccupied surface state propagating along the rows is not attenuate d at all. This indicates that the latter is a one-dimensional chain st ate, localized to individual atom rows.