Abstract
Conditions required to produce a (4 × 1) reconstruction on SnO2 (110) have been investigated and atomically resolved STM images of this surface have been obtained for the first time. Stable tunneling is most easily achieved at + 1.5 V sample bias. The (4 × 1) periodicity is well defined in these images. The greyscale contrast changes dramatically in images taken at + 1.0 V sample bias and structure within the unit cell is much better defined at the lower sample bias. The STM images are inconsistent with a model that has been proposed for the (4 × 1) surface which involves a coincident SnO overlayer, and an alternative model involving an ordered array of in-plane oxygen vacancies is proposed.
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