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PeakForce Tapping sequence highlighting unique lattice defects, as well as adsorbates. In this sequence you can also see 2 different adatoms appear on the surface and then disappear in subsequent frames.
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Another great advantage of PeakForce Tapping, particularly when imaging at the atomic scale, is you can obtain a forces curve for any pixel in the image. Here are two examples of force distance curves collected during Peak Force Tapping imaging. One set of approach / retract curves was collected on calcite and the other was collected on mica. The mica
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The cycle averaging of Tapping limits performance because 1) the high resolution tip-sample interaction only occurs when the tip is close to the sample, and this is a fraction of the cycle, and 2) at low imaging forces, the effects of long range forces dominate the cycle. (This is also why atomic Tapping images are done in fluid. . . eliminate the long
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Image of the cleavage plane of calcite taken with the Dimension FastScan using a standard cantilever (SNL+, 60um) in water. In the image you can see two crystal planes (brown and blue) separated by the dissolving crystal front (red). We have overlaid the atomic model of the oxygen atoms in the calcite on the lower plane, and there you can see the zig
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It’s good to see some community attempts at replicating the performance of the Dimension FastScan. The screen shot below is of a 1um, 512x512, 22Hz, Video of Celgard® taken with the Dimension FastScan (Video link at end). This demonstration is over twice as fast as the 10Hz video we show above. As you start to see different images and movies
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This experiment shows 275, 5um, 1024x1024 pixel image, taken at 17Hz (170um/s tip velocity). Each image is analyzed using the blind reconstruction method in the NanoScope SW to determine the estimated tip diameter, and is plotted versus image number. The results show that over this entire 270 image sequence, the tip remains extremely sharp and virtually
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Excerpts of Figure 13.25 and 13.29 from Magonov and Whangbo,"Surface Analysis with STM and AFM," VCH (1996). See video: for FastScan images