Phase measurement of a Fano window resonance using tunable attosecond pulses

Abstract

We study the photoionization of argon atoms close to the 3s${}^2$3p${}^6$ $\to$ 3s${}^1$3p${}^6$4p $\leftrightarrow$ 3s${}^2$3p${}^5$ $\epsilon \ell$, $\ell$=s,d Fano window resonance. An interferometric technique using an attosecond pulse train, i.e. a frequency comb in the extreme ultraviolet range, and a weak infrared probe field allows us to study both amplitude and phase of the photoionization probability amplitude as a function of photon energy. A theoretical calculation of the ionization process accounting for several continuum channels and bandwidth effects reproduces well the experimental observations and shows that the phase variation of the resonant two-photon amplitude depends on the interaction between the channels involved in the autoionization process.

5 pages, 4 figures

References in corpus (8)

• Phase-resolved attosecond near-threshold photoionization of molecular nitrogen
• Phase Measurement of Resonant Two-Photon Ionization in Helium
• Energy-dependent photoemission delays from noble metal surfaces by attosecond interferometry
• Interferometric phase detection at x-ray energies via Fano resonance control
• Modulation of attosecond beating in resonant two-photon ionization
• Two-photon finite-pulse model for resonant transitions in attosecond experiments
• Study of attosecond delays using perturbation diagrams and exterior complex scaling
• Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states

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