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On Compton scattering as a source of background in coherent diffraction imaging experiments.

Oier Bikondoa¹, Dina Carbone²

¹Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.

Journal of Synchrotron Radiation

|March 2, 2021

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Compton scattering, often ignored in diffraction, becomes significant in small-volume experiments. This incoherent radiation impacts coherent diffraction imaging resolution by smearing fringes, especially at high angles.

Area of Science:

Physics
Materials Science
Crystallography

Background:

Compton scattering (incoherent) is typically disregarded in diffraction due to its lack of interference effects at Bragg peaks.
However, reduced scattering volumes decrease the dominance of coherent (Rayleigh) scattering, making incoherent (Compton) contributions substantial.
This phenomenon is particularly relevant for coherent diffraction imaging (CDI) at high scattering angles.

Purpose of the Study:

To investigate the impact of Compton scattering on coherent diffraction imaging resolution.
To introduce a criterion relating object shape to achievable resolution in the presence of Compton scattering.
To quantify the Compton contribution for various object shapes and analyze its effect on resolution.

Main Methods:

Keywords:

X-rays coherence imaging scattering

Related Experiment Videos

Analysis of the interplay between coherent (Rayleigh) and incoherent (Compton) scattering contributions.

Development of a theoretical criterion linking object geometry to diffraction resolution.

Numerical quantification of Compton scattering effects for different sample shapes.

Main Results:

The incoherent Compton scattering background significantly degrades secondary interference fringes in CDI.
A novel criterion is established that quantifies the relationship between object shape and achievable resolution.
The maximum resolution achievable in CDI is shown to be strongly dependent on crystal shape and size, particularly along specific directions.

Conclusions:

Compton scattering is a critical factor limiting resolution in coherent diffraction imaging, especially for small or asymmetrically shaped samples.
The findings necessitate considering object shape and size when optimizing CDI experiments for high-resolution imaging.
Understanding and mitigating the effects of Compton scattering are crucial for advancing CDI techniques.