Dissociation of Single
2-Chloroanthracene Molecules
by STM-Tip Electron Injection
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Abstract
We have studied the adsorption and tip-induced chemistry
of 2-chloroanthracene
on TiO<sub>2</sub>(110). STM images show that at 135 K and low coverage,
i.e., ∼0.1 ML, these molecules are physisorbed along the five-coordinated
titanium rows on the rutile(110) surface as a result of electrostatic
interaction. Applying electric pulses >2.5 V from the STM
tip
to individual molecules causes either desorption or dissociation of
the molecules, as indicated by the changes in the STM images. We have
observed dissociative electron capture of a single 2-chloroanthracene
molecule, which leaves behind a surface chlorine atom adsorbed in
the on-top configuration on a surface Ti atom. The threshold energy
required for the dissociation was found to be ∼2.7 eV
