Imaging electron motion with attosecond time resolution
Imaging electron motion with attosecond time resolution
Imaging electron motion with attosecond time resolution
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Problems<br />
Problem #2:<br />
Discrete points violate causality<br />
Im[χ(k,ω)] must be defined on continuous ω interval. Periodicity incompatible <strong>with</strong><br />
causality.<br />
Solution:<br />
Analytic continuation (interpolate)<br />
Side effects:<br />
• χ(x,t) defined forever. Vanishes for t < 0.<br />
• Repeats <strong>with</strong> period T = 2π/∆ω = 13.8 femtoseconds<br />
• ∆ω plays role of rep rate
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