Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 47: Attosecond physics
A 47.1: Vortrag
Donnerstag, 20. März 2014, 16:30–16:45, BEBEL E42
A new twist in photoionization time delay — •Gopal Dixit1, Himadri Chakraborty2, Mohamed Madjet3, and Misha Ivanov1,4 — 1max Born Institute, Max-Born-Strasse 2A, 12489 Berlin, Germany — 2Department of Natural Sciences, Northwest Missouri State University, Missouri USA — 3Qatar Environment and Energy Research Institute, Qatar Foundation Doha, Qatar — 4Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
A series of provocative experiments and theoretical studies have brought the question of photoionization time delay to the forefront and the issue is still unresolved. In this talk, I will discuss the effects of electron-electron correlations on the valence photoionization time delay in Ar atom and will present our calculated results, which are in excellent agreement with the Lund group experimental results.
After establishing the delayed response of the outgoing electron to the photon as a result of electron correlations in the photoionization of atoms, I will go beyond the prototypical examples, namely the rare gas atoms, and to consider a more interesting and complex system. I will show effects of confinement and electron correlations on the relative time delay between the 3s and 3p photoionization of Ar confined endohedrally inside C60. Particular nuances of the delay process near a resonance and a Cooper minimum have been recognized. Interesting aspects of the time behavior of atomic emissions, when the atom is taken hostage inside a material confinement, will be discussed. In this context, emissions at the spectral region of the confiner*s plasmonic response are of particular interest.