Modulation of attosecond beating in resonant two-photon ionization

Abstract

We present a theoretical study of the photoelectron attosecond beating at the basis of RABBIT (Reconstruction of Attosecond Beating By Interference of Two-photon transitions) in the presence of autoionizing states. We show that, as a harmonic traverses a resonance, its sidebands exhibit a peaked phase shift as well as a modulation of the beating frequency itself. Furthermore, the beating between two resonant paths persists even when the pump and the probe pulses do not overlap, thus providing a sensitive non-holographic interferometric means to reconstruct coherent metastable wave packets. We characterize these phenomena quantitatively with a general finite-pulse analytical model that accounts for the effect of both intermediate and final resonances on two-photon processes, at a negligible computational cost. The model predictions are in excellent agreement with those of accurate ab initio calculations for the helium atom in the region of the N=2 doubly excited states.

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• Time-frequency representations of autoionization dynamics in helium
• Angle-resolved RABBIT: theory and numerics
• Continuous variable quantum state tomography of photoelectrons
• Attosecond delays in laser-assisted photodetachment from closed-shell negative ions
• Quantum coherent control of the photo\-electron angular distribution in bichromatic ionization of atomic neon
• Multiphoton interaction phase shifts in attosecond science
• Probing electronic decoherence with high-resolution attosecond photoelectron interferometry
• Attosecond delay of xenon $4d$ photoionization at the giant resonance and Cooper minimum
• Angular anisotropy of time delay in XUV/IR photoionization of H${}_2^{+}$
• Attosecond time delay in the photoionization of Mn in the region of the $3p\to 3d$ giant resonance
• Application of the Complex Kohn Variational Method to Attosecond Spectroscopy
• Ionisation dynamics through a Fano resonance: Time domain interpretation of spectral amplitudes
• Relation Between Photoionisation Cross Sections and Attosecond Time Delays
• Laser-assisted Fano resonance: attosecond quantum control and dynamical imaging
• Resonant photoionization and time delay
• Ionic Coherence in Resonant Above-Threshold Attosecond Ionization Spectroscopy
• Resonant Anisotropic Emission in Two-Photon Interferometric Spectroscopy
• Reconstruction of attosecond beating by interference of two-photon interband transitions in solids
• Coherent control of an Helium-Ion ensemble
• Modulation of attosecond beating by resonant two-photon transition
• Fano resonance in XUV generated by helium with few-cycle intense laser pulses and its classical analogy