Ultrafast imaging and the phase problem for inelastic X-ray scattering.
basic_science · Level V
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- Record sourced from PubMed, PMID 20401938.
- Also identified by DOI 10.1002/adma.200904098.
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Abstract
A new method for imaging ultrafast dynamics in condensed matter using inelastic X-ray scattering (IXS) is described. Using the concepts of causality and irreversibility a general solution to the inverse scattering problem (or "phase problem") for IXS is illustrated, which enables direct imaging of dynamics of the electron density with resolutions of approximately 1 attosecond (10(-18) s) in time and <1 A in space. This method is not just Fourier transformation of the IXS data, but a means to impose causality on the data and reconstruct the charge propagator. The method can also be applied to inelastic electron or neutron scattering. A general outline of phenomena that can and cannot be studied with this technique and an outlook for the future is provided.
Medical subject headings
- Scattering, Radiation