Chemistry Reference
In-Depth Information
4.3 Summary
A single water molecule on Cu(110) was imaged and characterized by STM. A
water molecule chemically adsorbs on top of a Cu atom below 20 K. The
adsorption structure was determined by the help of DFT calculations, suggesting
the water molecule adsorbs the on-top site with a slight displacement and a nearly
parallel configuration to the surface. The thermal diffusion along the atomic row
takes place even at 6 K with the rate of 0.13 s
-1
. Furthermore, the voltage and
current dependence of the diffusion rate showed the STM-induced process was
involved at the bias voltages above *40 mV, which results from the vibrational
excitation of the water-substrate stretching via inelastic electron tunneling process.
The mechanism is rationalized by anharmonic coupling between the water-sub-
strate stretching and the hindered translational mode correlating the hopping
coordinate. It was also found that water molecules can be manipulated in a con-
trolled fashion along the atomic row.
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