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Imaging electron motion with attosecond time resolution

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Lessons<br />

•Exciton in LiF is Frenkel, despite the old controversy.<br />

•No contradiction between CT and Frenkel. Lattice geometry not a<br />

constraint.<br />

•Causality allows solution to “phase problem” for IXS ⇒ zeptoseconds!<br />

•Is there information in this which cannot be read off the raw spectra!<br />

1. Extrapolation 2. Causality<br />

• χ(x,t) useful for analyzing extended sources

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