Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Event driven 4D STEM acquisition with a Timepix3 detector: microsecond
  dwell time and faster scans for high precision and low dose applications   Four dimensional scanning transmission electron microscopy (4D STEM) records
the scattering of electrons in a material in great detail. The benefits offered
by 4D STEM are substantial, with the wealth of data it provides facilitating
for instance high precision, high electron dose efficiency phase imaging via
center of mass or ptychography based analysis. However the requirement for a 2D
image of the scattering to be recorded at each probe position has long placed a
severe bottleneck on the speed at which 4D STEM can be performed. Recent
advances in camera technology have greatly reduced this bottleneck, with the
detection efficiency of direct electron detectors being especially well suited
to the technique. However even the fastest frame driven pixelated detectors
still significantly limit the scan speed which can be used in 4D STEM, making
the resulting data susceptible to drift and hampering its use for low dose beam
sensitive applications. Here we report the development of the use of an event
driven Timepix3 direct electron camera that allows us to overcome this
bottleneck and achieve 4D STEM dwell times down to 100~ns; orders of magnitude
faster than what has been possible with frame based readout. We characterise
the detector for different acceleration voltages and show that the method is
especially well suited for low dose imaging and promises rich datasets without
compromising dwell time when compared to conventional STEM imaging.

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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: eess