TiO2 (110) experiment
M.Wagner# D.A.Bonnell* and M.Rühle#
#Max-Planck-Institut für Metallforschung, Seestraße 92, D-70174 Stuttgart, Germany
*Dept. of Mat. Sci. & Eng., University of Pennsylvania, Philadelphia, PA 19104, USA.
A number of reconstructions have been observed on the (110) surface of TiO2 in the rutile modification that accommodate oxygen deficiency. We present atomically resolved STM images that describe a new reconstruction with (3x2) symmetry. A model for the observed reconstruction is discussed where this symmetry is achieved by removing 1/3 or 2/3 of the oxygen in the bridging oxygen rows such that a shift in position of missing oxygen by one lattice space vector along the  direction occurs in every third row. This structure contrasts those reported previously in which entire rows are modified or removed.