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  X-ray phase-contrast imaging: the quantum perspective

Slowik, J. M., & Santra, R. (2013). X-ray phase-contrast imaging: the quantum perspective. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(16): 164016. doi:10.1088/0953-4075/46/16/164016.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-23F6-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-23F7-8
Genre: Journal Article

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 Creators:
Slowik, Jan Malte1, 2, 3, Author              
Santra, Robin2, 3, 4, Author
Affiliations:
1International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
2Center for Free-Electron Laser Science, DESY, D-22607 Hamburg, Germany, ou_persistent22              
3Department of Physics, University of Hamburg, D-20355 Hamburg, Germany, ou_persistent22              
4Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA, ou_persistent22              

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 Abstract: Time-resolved phase-contrast imaging using ultrafast x-ray sources is an emerging method to investigate ultrafast dynamical processes in matter. Schemes to generate attosecond x-ray pulses have been proposed, bringing electronic timescales into reach and emphasizing the demand for a quantum description. In this paper, we present a method to describe propagation-based x-ray phase-contrast imaging in nonrelativistic quantum electrodynamics. We explain why the standard scattering treatment via Fermi’s golden rule cannot be applied. Instead, the quantum electrodynamical treatment of phase-contrast imaging must be based on a different approach. It turns out that it is essential to select a suitable observable. Here, we choose the quantum-mechanical Poynting operator. We determine the expectation value of our observable and demonstrate that the leading order term describes phase-contrast imaging. It recovers the classical expression of phase-contrast imaging. Thus, it makes the instantaneous electron density of non-stationary electronic states accessible to time-resolved imaging. Interestingly, inelastic (Compton) scattering does automatically not contribute in leading order, explaining the success of the semiclassical description.

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Language(s): eng - English
 Dates: 2013-04-292013-03-012013-08-132013-08-28
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1088/0953-4075/46/16/164016
 Degree: -

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Title: Journal of Physics B: Atomic, Molecular and Optical Physics
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 46 (16) Sequence Number: 164016 Start / End Page: - Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/0022-3700