Energy-Dependent Photoemission Time Delays of Noble Gas Atoms Using Coincidence Attosecond Streaking

We present photoemission time-delay measurements between electrons originating from the valence shells of neon and argon obtained by attosecond streaking. After giving a brief review of the different techniques, we focus on more detailed analysis using the attosecond streaking technique. We show that the temporal structure of the ionizing single attosecond pulse may significantly affect the obtained time delays, and we propose a procedure how to take this contribution properly into account. Our analysis reveals a delay of a few tens of attoseconds in a photon energy range between 28 and 40 eV in the emission of electrons ionized from argon with respect to those liberated from neon.