Time-frequency representations of autoionization dynamics in helium
arXiv:1709.07639 · doi:10.1088/1361-6455/aaa057
Abstract
Autoionization, which results from the interference between direct photoionization and photoexcitation to a discrete state decaying to the continuum by configuration interaction, is a well known example of the important role of electron correlation in light-matter interaction. Information on this process can be obtained by studying the spectral, or equivalently, temporal complex amplitude of the ionized electron wavepacket. Using an energy-resolved interferometric technique, we measure the spectral amplitude and phase of autoionized wavepackets emitted via the sp2+ and sp3+ resonances in helium. These measurements allow us to reconstruct the corresponding temporal profiles by Fourier transform. In addition, applying various time-frequency representations, we observe the build up of the wavepackets in the continuum, monitor the instantaneous frequencies emitted at any time and disentangle the dynamics of the direct and resonant ionization channels.
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- Probing electronic decoherence with high-resolution attosecond photoelectron interferometry
- Raman interferometry between autoionizing states to probe ultrafast wavepacket dynamics with high spectral resolution
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- Attoscience in Phase Space
- Towards the complete phase profiling of attosecond wave packets
- Ionisation dynamics through a Fano resonance: Time domain interpretation of spectral amplitudes
- Time-resolved Spectroscopy of Interparticle Coulombic Decay Processes
- Resonant photoionization and time delay
- Reconstruction of attosecond beating by interference of two-photon interband transitions in solids
- Fano line shape metamorphosis in resonant two-photon ionization
- Circular RABBITT goes under threshold