= 2001 isolated attosecond pulse experiment
The experiment involving <Ferenc Krausz> combined a subfemtosecond soft-<X-ray> pulse with a few-cycle visible <electric field>. Its delay-dependent <krypton> <photoelectron> spectra tested the field-controlled response. The reported pulse duration was $650\pm150$ attoseconds. Changing delay compared the emitted <Electron> distributions at different reference phases; the spectral-width trace supplied a further duration-sensitive observable.<Attosecond metrology by Michael Hentschel and others>[Attosecond metrology, abstract and Figs.3–5: krypton spectra, delay scan and width]{ref}
The distinction from <RABBITT> is the measurement regime and reconstruction, rather than merely calling one trace a clock. The <attosecond streaking> <momentum> map is a limiting model; a finite-duration <wave packet> requires a quantum transition calculation. Inferring an emission delay also requires separating the illuminating pulse's <spectral phase> from the target response. The measurement supports time-dependent <photoionization> in a specified model, with no unique classical <Electron> trajectory inside an <atomic orbital> implied.
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