Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tracking the Picoscale Spatial Motion of Atomic Columns During Dynamic
  Structural Change   In many materials systems, such as catalytic nanoparticles, the ability to
characterize dynamic atomic structural changes is important for developing a
more fundamental understanding of functionality. Recent developments in direct
electron detection now allow image series to be acquired at frame rates on the
order of 1000 frames per second in bright-field transmission electron
microscopy (BF TEM), which could potentially allow dynamic changes in the
atomic structure of individual nanoparticles to be characterized with
millisecond temporal resolution in favourable cases. However, extracting such
data from TEM image series requires the development of computational methods
that can be applied to very large datasets and are robust in the presence of
noise and in the non-ideal imaging conditions of some types of environmental
TEM experiments. Here, we present a two-dimensional Gaussian fitting algorithm
to track the position and intensities of atomic columns in temporally resolved
BF TEM image series. We have tested our algorithm on experimental image series
of Ce atomic columns near the surface of a ceria (CeO2) nanoparticle with
electron beam doses of ~125-5000 e-{\AA}-2 per frame. The accuracy of the
algorithm for locating atomic column positions is compared to that of the more
traditional centroid fitting technique, and the accuracy of intensity
measurements is evaluated as a function of dose per frame. The code developed
here, and the methodology used to explore the errors and limitations of the
measurements, could be applied more broadly to any temporally resolved TEM
image series to track dynamic atomic column motion.

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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph