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 photoemission time delays requires taking into account the measurement process, involving the interaction with a probing infrared field. This contribution can be estimated using a universal formula and is found to account for a substantial fraction of the measured delay.
Highlights
The interaction of light with matter is an essential process in nature and, in particular, the photoelectric effect has been studied during decades using synchrotron radiation [1]
We study photoionization of argon atoms excited by attosecond pulses using an interferometric measurement technique
Our method uses a frequency comb of high-order harmonics with photon energies varying from 32 to 42 eV for the photoionization and a weak ir field for probing the outgoing electrons
Summary
The interaction of light with matter is an essential process in nature and, in particular, the photoelectric effect has been studied during decades using synchrotron radiation [1]. We measure the difference in time delays between electrons emitted from the 3s2 and from the 3p6 shell, at different excitation energies ranging from 32 to 42 eV. The determination of photoemission time delays requires taking into account the measurement process, involving the interaction with a probing infrared field.
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