Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Attosecond Science II

A 8.1: Hauptvortrag

Montag, 5. März 2018, 14:00–14:30, K 1.011

Attosecond timing with spectral resolution near resonances, and new opportunities with high-repetition rate attosecond sources — •Anne Harth — Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland

To directly observe the ultrafast motion of electrons in atomic or molecular systems is an aspect of fundamental physics and is achievable thanks to the generation of attosecond pulses in the XUV spectral range, whereby attosecond pulse trains play by no means a less important role than single isolated attosecond pulses. A key advantage of using pulse trains is the high spectral resolution, while high temporal resolution is still retained [1]. In this talk we will provide an overview of attosecond measurements using attosecond pulse trains near resonances; the role of continuum-continuum transition in attosecond time delay measurement will be discussed within a perturbative approach.

Furthermore, we will discuss the present achievements and future steps towards high-repetition rate attosecond experiments based on optical parametric amplifier systems driving high-order harmonic generation [2]. Experiments involving e.g. double photoionisation dynamics of atoms or complex molecules, which require so-called kinematically complete measurements of all charged fragments [3], greatly benefit from high-repetition rate attosecond sources.

[1] Isinger et al. Science 358, 893 (2017)

[2] Harth et al. Journal of Optics 20, 014007 (2018)

[3] Ullrich et al. Reports on Progress in Physics 66, 1463 (2003)