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Photoionization in the time and frequency domain

Journal article
Authors Marcus Isinger
Richard J. Squibb
D. Busto
S. Zhong
A. Harth
D. Kroon
S. Nandi
C.L. Arnold
M. Miranda
J.M. Dahlström
E. Lindroth
Raimund Feifel
M. Gisselbrecht
A. L'Huillier
Published in Science
Volume 358
Issue 6365
Pages 893-6
ISSN 0036-8075
Publication year 2017
Published at Department of Physics (GU)
Pages 893-6
Language en
Links doi.org/10.1126/science.aao7043
https://gup.ub.gu.se/file/207099
Keywords HIGH HARMONIC-GENERATION; CORRELATION SATELLITES; PHOTOELECTRON-SPECTRA; HIGH-RESOLUTION; FANO RESONANCE; ATTOSECOND; SPECTROSCOPY; SCATTERING; DYNAMICS; STATES
Subject categories Atomic physics

Abstract

Ultrafast processes in matter, such as the electron emission following light absorption, can now be studied using ultrashort light pulses of attosecond duration (10−18 s) in the extreme ultraviolet spectral range. The lack of spectral resolution due to the use of short light pulses has raised issues in the interpretation of the experimental results and the comparison with theoretical calculations. We determine photoionization time delays in neon atoms over a 40 eV energy range with an interferometric technique combining high temporal and spectral resolution. We spectrally disentangle direct ionization from ionization with shake-up, in which a second electron is left in an excited state, and obtain excellent agreement with theoretical calculations, thereby solving a puzzle raised by 7-year-old measurements.

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