Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Amplitude dependence of image quality in atomically-resolved bimodal
  atomic microscopy   In bimodal FM-AFM, two flexural modes are excited simultaneously. The total
vertical oscillation deflection range of the tip is the sum of the peak-to-peak
amplitudes of both flexural modes (sum amplitude). We show atomically resolved
images of KBr(100) in ambient conditions in bimodal AFM that display a strong
correlation between image quality and sum amplitude. When the sum amplitude
becomes larger than about 200 pm, the signal-to-noise ratio (SNR) is
drastically decreased. We propose this is caused by the temporary presence of
one or more water layers in the tip-sample gap. These water layers screen the
short range interaction and must be displaced with each oscillation cycle.
Further decreasing the sum amplitude, however, causes a decrease in SNR.
Therefore, the highest SNR in ambient conditions is achieved when the sum
amplitude is slightly less than the thickness of the primary hydration layer.

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The categories of this paper are: eess
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom