Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 14: Poster Session - Atomic Physics II

A 14.5: Poster

Tuesday, March 10, 2020, 16:00–18:00, Empore Lichthof

Electron correlation induced hole dynamics in high harmonic generation by bicircular laser fields — •Nicola Mayer, Álvaro Jiménez-Galán, Serguei Patchkovskii, and Misha Ivanov — Max Born Institute, Max-Born-Straβe 2A, 12489 Berlin, Germany

The use of bicircular laser fields to drive the high-harmonic generation (HHG) process allows for the generation of circularly polarized extreme-ultraviolet (XUV) light, hence paving the way for the study of chiral phenomena on the attosecond timescale. In the case where the frequency ratio between the two counter-rotating drivers is 2:1, the 3N+1 and 3N+2 harmonic orders are allowed, while 3N harmonics are nominally forbidden by symmetry. In Ref. [1] strong forbidden 3N lines were nonetheless observed in Helium; their appearance was attributed to the excitation of Rydberg states via the Frustrated Tunneling Ionization (FTI) mechanism [2]. In this contribution, we investigate the role of the Rydberg states in the electron-correlation-induced dynamics in the bicircular scheme of HHG. In particular, we show how the long-range Coulomb interaction between the tunneled electron and the parent ion together with the spin-orbit interaction in the core can lead to rich dynamics in the ion of a noble gas with np valence shell such as Argon or Neon. We investigate the role of the hole dynamics in the Ar and Ne ions in the high-harmonic generation process and address the possibility of observing the hole dynamics via the background-free measurement of forbidden 3N harmonic lines.

[1] A.Jiménez-Galán et al., Optics Express, Vol. 25, No. 19, (2017).

[2] T. Nubbemeyer, Phys. Rev. Lett., Vol. 101, No. 233001, (2008).