Abstract
Wave packet interferometry provides benchmark information on light-induced electronic quantum states by monitoring their relative amplitudes and phases during coherent excitation, propagation, and decay. The relative phase control of soft x-ray pulse replicas on the single-digit attosecond timescale achieved in our experiments makes this method a powerful tool to probe ultrafast quantum phenomena such as the excitation of Auger shake-up states with sub-cycle precision. In this contribution we present first results obtained for different Auger decay channels upon generating L-shell vacancies in argon atoms using Michelson-type all-reflective interferometric autocorrelation at a central free-electron laser photon energy of 274.7 eV.
Highlights
The Auger effect is the emission of a secondary electron in the non-radiative decay of a core-hole excitation [1]
In this contribution we present first results obtained for different Auger decay channels upon generating L-shell vacancies in argon atoms using Michelson-type all-reflective interferometric autocorrelation at a central free-electron laser photon energy of 274.7 eV
The static electron spectrum using single-spike free-electron laser (FEL) pulses characterized by a high degree of longitudinal coherence with a central photon energy of 274.7 eV is shown in figure 2
Summary
European XFEL GmbH, Schenefeld, Germany. ∗ Author to whom any correspondence should be addressed. A hot topic in modern attosecond science is the investigation of the so-called Eisenbud–Wigner–Smith time delay, which is a measure for the spectral variation of the scattering phase [4] In simple words, this is the time interval in photoemission between the absorption of a photon and the emission of an electron into the continuum. Photoemission delays [6,7,8,9,10,11] were measured either by ‘attosecond streaking’ [12] or with the socalled ‘attosecond clock’ technique [13,14,15,16] and ‘RABITT’ (reconstruction of attosecond beating by interference of twophoton transitions) [17, 18] All of these methods rely on optical laser fields (IR-VIS) synchronized with extreme precision to a short-wavelength pulse or pulse train used for photoionization. We used electron wave packet interferometry to measure relative phase shifts of different Auger and direct photoionization channels on the attosecond time scale upon generating an L-shell vacancy (L2,3)
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