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Time-frequency representation of autoionization dynamics in helium

Journal article
Authors D. Busto
L. Barreau
M. Isinger
M. Turconi
C. Alexandridi
A. Harth
S. Zhong
Richard J. Squibb
D. Kroon
S. Plogmaker
M. Miranda
A. Jimenez-Galan
L. Argenti
C. L. Arnold
Raimund Feifel
F. Martin
M. Gisselbrecht
A. L'Huillier
P. Salieres
Published in Journal of Physics B-Atomic Molecular and Optical Physics
Volume 51
Issue 4
ISSN 0953-4075
Publication year 2018
Published at Department of Physics (GU)
Language en
Keywords Photoionisation, autoionisation, Fano resonance, Wigner delay, attosecond pulses, RABBIT, time-frequency representations, higher order harmonic-generation
Subject categories Physical Sciences


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.

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