Scanning tunneling microscopy and first-principles atomic orbital based calculations have been used to study ${\mathrm{TiO}}_2\mathrm{}\left(110\right)1\times 2.$ A structure is proposed that resolves the controversy surrounding the surface morphology. Our model is simple, in that it consists only of atoms in their bulk-terminated positions. Theoretical modeling of the images shows an agreement with the experimental data that cannot be achieved even qualitatively for the previously proposed models. Furthermore, a previously unobserved $1\times 3$ phase has been imaged that can be simply explained in terms of the model.

• Received 4 March 1998

DOI:https://doi.org/10.1103/PhysRevB.58.1586