Probing single-photon ionization on the attosecond time scale

Abstract

We study photoionization of argon atoms excited by attosecond pulses using an interferometric measurement technique. We measure the difference in time delays between electrons emitted from the $3s^2$ and from the $3p^6$ shell, at different excitation energies ranging from 32 to 42 eV. The determination of single photoemission time delays requires to take into account the measurement process, involving the interaction with a probing infrared field. This contribution can be estimated using an universal formula and is found to account for a substantial fraction of the measured delay.

4 pages, 4 figures, under consideration

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• Delay in atomic photoionization
• Phase Measurement of Resonant Two-Photon Ionization in Helium
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