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In the article below, hydrated TiO2 surfaces are depicted. How can I determine (i.e. identify) a monolayer of (001) and (101) TiO2 in figure 1, and is "(1/3) ML" described in figure 1d referring to the coverage, the TiO2, or what?

How does one determine a monolayer in general? How is the monolayer of (101) and (001) determined?

Article can be found here:
http://pubs.acs.org/doi/abs/10.1021/jp055311g?journalCode=jpcbfk

#### Solution Preview

In the attached article, hydrated TiO2 surfaces are depicted. How can I determine (i.e. identify) a monolayer of (001) and (101) TiO2 in figure 1, and is "(1/3) ML" described in figure 1d referring to the coverage, the TiO2, or what?

How does one determine a monolayer in general? How is the monolayer of (101) and (001) determined?

I will raise the bid if this requires more research or work.

Difference between (001) and (101) planes of TiO2

In (001) plane, all Ti atoms on the surface are only 5 -fold coordinated, while the (101) surface contains rows of fully (6 -fold) coordinated and 5 -fold coordinated Ti atoms, constraining the orientation of adsorbed molecules.

What is 'ML' in this paper?

Good question! No where does the author specify what 'ML' stands for, although the full form should be given on the very first instance where it appears in the paper! What they wanted to mean by 'ML' is, 'monolayer'. So (1/3) ML means 1/3 rd surface coverage here.

What is monolayer, how do they form, and how are they measured?

A monolayer is a single, closely packed layer of atoms, ...

#### Solution Summary

The solution clarifies the basic concepts associated with the problem, in a easily understandable manner.

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