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The microscopic image of a sample scanned in liquid is shown in Figure 2. The samplewas scanned in liquid mode with a UHV non-contact atomic forcemicroscope (AFM) with a tip-sample separation of 0.03 nm. The sample was thesurface of muscovite mica. The surface was scanned over an area about0.03x0.03 microns. The topographic image of the sample surface isshown in Figure 3. Figures 3 and 4 are magnified images of the surface ofa muscovite mica under different magnifications. The areas of black dotsare due to the presence of vacancies in the mica surface. It isnoticable that the monolayer of muscovite mica is only about 0.8 nm thick(which is the monolayer thickness of muscovite mica). The imagecan also be compared with that of a fractured muscovite mica surface. It canbe seen that there is an obvious difference. The cracks are about the size ofa single atom and the surface is atomically rough. The adsorption of aprotic liquids (methanol in this case) helps to make themuscovite mica surface smoother than that in air. The tip-sample separationof non-contact AFM is a critical issue for the atomic resolution ofapatterns. For example, the interactions between the tip and the samplein non-contact AFM not only affect the imaging of atomic patterns,but also introduce a significant tip-sample friction. This tip-samplefriction can be described by the adhesive force between the tipand the sample. If the tip-sample friction is strong enough, thesurface of the sample can be destroyed even with a small tip-sample separation.In non-contact AFM, the tip-sample separation is always less than0.1 nm. The tip-sample friction is the most critical factor for theresolution of atomic patterns. It has been known that the tip-samplefriction depends on the nature of the tip and the sample. In the case ofhydrogen-passivated tips, the friction can be measured to be lessthan 1 fN. Atomic resolution images of a sample scanned in non-contact AFM can't be resolved with the current tips. It is now known that atomicresolution can be achieved by a special tip with 827ec27edc