Publikation:

Signal-to-noise in femtosecond electron diffraction

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2015

Autor:innen

Kealhofer, Catherine
Lahme, Stefan
Urban, Theresa

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https://doi.org/10.1016/j.ultramic.2015.07.004
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Ultramicroscopy. 2015, 159(1), pp. 19-25. ISSN 0304-3991. eISSN 1879-2723. Available under: doi: 10.1016/j.ultramic.2015.07.004

Zusammenfassung

Pump-probe electron diffraction can directly record atomic-scale motion within molecules or materials. However, the available current in femtosecond experiments is limited, making it challenging to reach the sensitivity required for detecting the fastest structural dynamics, which are encoded in time-dependent diffraction intensities. Here we present a unified analysis of signal-to-noise for an ultrafast electron diffraction apparatus. We characterize the noise of realistic ultrafast electron sources and detectors, test the performance on crystalline and polycrystalline samples and discuss practical approaches for improving measurement sensitivity. The analysis is found sufficient to predict the achievable signal-to-noise ratio in pump-probe electron diffraction before actually starting an investigation.

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Fachgebiet (DDC)
530 Physik

Schlagwörter

Ultrafast electrondiffraction, Pump-probe techniques, 4D microscopy, Femtosecond crystallography, Electron pulses

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ISO 690KEALHOFER, Catherine, Stefan LAHME, Theresa URBAN, Peter BAUM, 2015. Signal-to-noise in femtosecond electron diffraction. In: Ultramicroscopy. 2015, 159(1), pp. 19-25. ISSN 0304-3991. eISSN 1879-2723. Available under: doi: 10.1016/j.ultramic.2015.07.004
BibTex
@article{Kealhofer2015-12Signa-43269,
  year={2015},
  doi={10.1016/j.ultramic.2015.07.004},
  title={Signal-to-noise in femtosecond electron diffraction},
  number={1},
  volume={159},
  issn={0304-3991},
  journal={Ultramicroscopy},
  pages={19--25},
  author={Kealhofer, Catherine and Lahme, Stefan and Urban, Theresa and Baum, Peter}
}
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