Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 11: Attosecond physics II
A 11.2: Talk
Tuesday, March 10, 2020, 14:30–14:45, f107
Attosecond pump-probe coincidence spectroscopy at 100 kHz — •Mikhail Osolodkov1, Tobias Witting1, Federico Furch1, Felix Schell1, Fabio Cavalcante2, Carmen Menoni2, Claus Peter Schulz1, and Marc J.J. Vrakking1 — 1Max Born Institute, Berlin, Germany — 2Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, USA
Photoinduced coupled electron-nuclear dynamics in molecules typically proceeds on a femtosecond timescale which can be studied by attosecond pump-probe spectroscopy. Here we report on the setup of an extreme ultraviolet - near infrared (XUV-NIR) pump probe beamline operating at 100 kHz, which is combined with a reaction microscope, designed for high repetition rate operation [1]. The latter allows to measure the 3D momentum distributions of electrons and ions in coincidence and, thus, will enable detailed insights into photoinduced molecular processes. The beamline utilizes a high power noncollinear optical parametric chirped pulse amplification system (NOPCPA) operating at 100 kHz [2]. Both, XUV attosecond pulse trains (APTs), as well as isolated attosecond pulses (IAPs) can be generated through the high-order harmonic generation process (HHG) and delivered to the experiment together with synchronized NIR pulses. We present first results of pump-probe coincidence spectroscopy measurements, performed utilizing argon and molecular nitrogen as a target with XUV APTs and approximately 7 fs FWHM NIR pulses.
[1] Sascha Birkner, PhD thesis, Freien Universitat Berlin (2015)
[2] Federico J. Furch et al., Optics Letters 42, 2495-2498 (2017)