Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Poster: Interaction with VUV and X-ray light
A 24.7: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
Theory of field-assisted post-collision interaction in Auger decay of atoms — •Sebastian Bauch1, Bernd Schütte2,3, Ulrike Frühling2, Markus Drescher2, and Michael Bonitz1 — 1Christian-Albrechts-Universität Kiel — 2Universität Hamburg — 3Max-Born-Institut Berlin
Post-collision interaction (pci) is a three-body effect being present in photo-induced Auger decay if the Auger electron (AE) is significantly faster than the preceding photoelectron (PE). Under these conditions, the AE experiences a rapid change of the ion's potential upon overtaking of the PE due to altered screening. This is connected with an exchange of energy between both electrons, the net amount of which depends on the AE's release time.
Utilizing extensive simulations based on the time-dependent Schrödinger equation as well as classical molecular dynamics, we show that pci, in the presence of a laser field, imprints a non-linear negative chirp on the AE's energy. Our theoretical results are in good agreement with recent experiments based on the light-driven THz streak camera [1,2] for MNN decay in Krypton and NOO decay in Xenon. The physical mechanism is explained within an analytical model for the line shape of the Auger electron, incorporating the effect of field-assisted pci.
[1] U. Frühling et al., Nat. Photon. 3 523 (2009)
[2] B. Schütte et al., submitted to Phys. Rev. Lett. (2011)