Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.48: Poster

Tuesday, March 6, 2018, 16:15–18:15, Redoutensaal

The signature of electron correlation in HHG spectra from a He atom — •Julius Rapp and Dieter Bauer — Universität Rostock

We present high-harmonic generation (HHG) spectra from He obtained by numerical simulations which fully treat electron correlation. As expected, the major part of the spectrum is exactly reproduced by single-active-electron modeling. However, beyond the first plateau’s cutoff at 3.17 U_p + 1.3 I_p^He we find a second plateau with orders of magnitude less HHG yield. Interestingly, the characteristics of those additional HHG features significantly differ from the singly charged ion’s HHG signature. We illustrate the disentanglement of several possible explanations by time-frequency analyses and extended simple-man’s modeling based on the strong-field approximation.