Hydrogen adatoms on TiO2(110)-(1 x 1) characterized by scanning tunneling microscopy and electron stimulated desorption

Hydrogen atoms adsorbed on TiO2(110)-(1 x 1) surfaces have been characterized by scanning tunneling microscopy (STM) combined with electron stimulated desorption (ESD) technique. Certain amounts of H atoms are unexpectedly found on the TiO2 surfaces annealed at 900 K. Two forms of adsorption were discriminated in STM images from the different sensitivity to ESD and tentatively assigned to hydroxyl-type (O-H) and hydride-type (Ti-H) species.