Chemistry Reference
In-Depth Information
Fig. 10.8 a Yields of H-atom relay reactions as a function of the applied bias voltage measured
for an H
2
O-(OH)
2
(red circles), D
2
O-(OD)
2
(blue squares), and H
2
O-(OH)
3
(green triangles).
The inset shows a typical current trace recorded with the tip fixed over the protrusion for an H
2
O-
(OH)
2
at V
s
= 213 mV. The two-state fluctuation indicates the back-and-forth relay reaction in
the chain. The red and blue curves are Eq.
10.10
applied to an H
2
O-(OH)
2
and D
2
O-(OD)
2
data,
respectively, with the parameters in Table
10.1
. b The current dependence of the reaction rates
for an H
2
O-(OH)
2
(red circles) and D
2
O-(OD)
2
(blue squares) at various voltages. The slopes
were estimated to be 0.82 ± 0.03, 0.95 ± 0.02, 0.97 ± 0.04, and 0.93 ± 0.05 for V
s
= 443, 343,
223 and 210 mV, respectively. The data are presented in logarithmic scale and the slopes are
close to unity, indicating single-electron processes in the whole voltage range. c Position
dependence of the yield along the chain for an H
2
O-(OH)
2
at V
s
= 243 mV (blue squares) and
V
s
= 443 mV (red circles).The position is represented by the distance from the center of the
inversion along [001], as shown in the inset with the STM image. While the yield is broadly
distributed over the complex at V
s
= 443 mV, it is more localized at V
s
= 243 mV above the
protrusion (water molecule)
