Time-Frequency Representation Of Autoionization Dynamics In Helium

Keywords

attosecond pulse; autoionization; Fano resonance; RABBIT; time-frequency representations; Wigner

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 wave packet. Using an energy-resolved interferometric technique, we measure the spectral amplitude and phase of autoionized wave packets 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 wave packets in the continuum, monitor the instantaneous frequencies emitted at any time and disentangle the dynamics of the direct and resonant ionization channels.

Publication Date

1-23-2018

Publication Title

Journal of Physics B: Atomic, Molecular and Optical Physics

Volume

51

Issue

4

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/1361-6455/aaa057

Socpus ID

85041177280 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85041177280

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