SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 27: Poster III

A 27.12: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Attosecond-precision dynamics of a laser-driven two-electron wave packet in helium — •Shuyuan Hu, Yu He, Gergana Borisova, Maximillian Hartmann, Paul Birk, Christian Ott, and Thomas Pfeifer — Saupfercheckweg 1, 69117 Heidelberg

We have combined attosecond transient absorption spectroscopy (ATAS) and attosecond streaking spectroscopy to simultaneously measure the resonant photoabsorption spectra of laser-coupled doubly excited states in helium, together with the streaked photoelectron spectra. The streaking measurement reveals the absolute time delay zero and the full temporal profile of the electric fields which is incorporated in a time-dependent few-level simulation of the laser-coupled states in helium. Comparing the 1-fs time-scale modulations across the 2s2p(1P) and sp2,3+(1P) doubly excited states between the time-delay-calibrated simulation and the measurement, we identify the sign convention of the transition dipole matrix elements for the laser-coupled autoionizing states 2s2p-2p2 and 2p2-sp2,3+ to be opposite of each other.