Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 43: Ultrafast Dynamics III and High-harmonic Generation (joint session MO/A)
A 43.6: Vortrag
Freitag, 15. März 2024, 15:45–16:00, HS 3044
Orbital interference effects in low-order harmonic generation in benzene — •Samuel Schöpa, Falk-Erik Wiechmann, Franziska Fennel, and Dieter Bauer — Universität Rostock, Rostock, Germany
We explore the impact of the driving laser’s ellipticity and polarization on the low-order harmonic spectrum of benzene and find a strong interference in the 5th harmonic between emission originating from transitions between π orbitals and emission from σ orbitals. The contribution of the π orbitals entirely vanishes due to interference for driving with a laser polarized along a σv mirror axis. However, the π orbital’s contribution takes over for elliptic polarization while being fundamentally different from the σ orbital emission, i.e., having the opposite helicity and a perpendicular major polarization axis. The resulting interference yields a complex dependence of the low-order harmonic spectrum of benzene on the ellipticity and the polarization of the driving field.
Keywords: HHG; harmonic generation; benzene; polarization; electronic structure