Abstract
We determine relative photoemission time delays between valence electrons in different noble gas atoms (Ar, Ne and He) in an energy range between 31 and 37 eV. The atoms are ionized by an attosecond pulse train synchronized with an infrared laser field and the delays are measured using an interferometric technique. We compare our results with calculations using the random phase approximation with exchange and multi-configurational Hartree–Fock. We also investigate the influence of the different ionization angular channels.
Highlights
Introduction to attosecond delays in photoionizationJ M Dahlström, A L’Huillier and A Maquet Recent citations- Attosecond precision in delay measurements using transient absorption spectroscopy Maximilian Hartmann et al- Controlling Subcycle Optical Chirality in the Photoionization of Chiral Molecules S
An important application of attosecond pulses [5, 6] that has arisen during the last few years is the measurement of the photoemission time delay, equal to the derivative of the phase of the ionization transition matrix element with respect to the energy [7,8,9]
The photoionization time delay can be interpreted as the group delay of the outgoing ionized electronic wave packet created by the absorption of an attosecond pulse, as it propagates in the atomic potential [10, 11]
Summary
Introduction to attosecond delays in photoionizationJ M Dahlström, A L’Huillier and A Maquet Recent citations- Attosecond precision in delay measurements using transient absorption spectroscopy Maximilian Hartmann et al- Controlling Subcycle Optical Chirality in the Photoionization of Chiral Molecules S. An important application of attosecond pulses [5, 6] that has arisen during the last few years is the measurement of the photoemission time delay, equal to the derivative of the phase of the ionization transition matrix element with respect to the energy [7,8,9]. This phase is not the same as the relative phase between the different channels. We refer the reader to [26] for detailed manipulations of the twophoton matrix element
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