Observation and destruction of an elusive adsorbate with STM: O$_2$/TiO$_2$

Details Observation and destruction of an elusive adsorbate with STM: O$_2$/TiO$_2$ Observation and destruction of an elusive adsorbate with STM: O$_2$/TiO$_2$

2010-09-08

arxiv.org/abs/1009.1479v2

Phys. Rev. Lett. 105, 216101 (2010)

Physics

Condensed Matter

Materials Science

Submitted to Physical Review Letters. 4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.105.216101

When a slightly defective rutile TiO$_2$(110) surface is exposed to O$_2$ at elevated temperatures, the molecule dissociates at defects, filling O vacancies (\ov) and creating O adatoms (\oad) on {\tifc} rows. The adsorption of molecular O$_2$ at low temperatures has remained controversial. Low-Temperature Scanning Tunneling Microscopy (LT-STM) of O$_2$, dosed on TiO$_2$(110) at a sample temperature of $\approx$ 100 K and imaged at 17 K, shows a molecular precursor at \ov as a faint change in contrast. The adsorbed O$_2$ easily dissociates during the STM measurements, and formation of \oad's at both sides of the original \ov is observed.

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