Freiburg 2019 – wissenschaftliches Programm
FM 41.20: Poster
Dienstag, 24. September 2019, 16:30–18:30, Tents
100 kHz Attosecond Pulse Source for Coincidence Spectroscopy — •Dominik Ertel1, Anna-Lena Jäger1, Samuel Kellerer1, Matteo Moioli1, Hamed Ahmadi1, Fabio Frassetto2, Luca Poletto2, and Giuseppe Sansone1 — 1Institute of Physics, University of Freiburg, Stefan-Meier-Str. 19, 79104 Freiburg, Germany — 2CNR-Institute of Photonics and Nanotechnologies (CNR-IFN), via Trasea 7, 35131 Padova, Italy
Attosecond coincidence spectroscopy builds a powerful tool to study ultrafast phenomena in atoms and molecules. Here, we present an attosecond XUV pulse source with high repetition rates up to 100 kHz, developed for photoelectron/-ion coincidence spectroscopy. Near infrared (NIR) laser pulses with up to 400 µJ pulse energy and a pulse duration of around 300 fs are temporally compressed using a gas-filled hollow-core fiber. Afterwards we use these pulses to generate trains of attosecond pulses via high-order harmonic generation in noble gases. RABITT (Reconstruction of Attosecond Beating by Interference of Two-photon Transitions) based coincidence pump-probe spectroscopy is performed using a reaction microscope. The long acquisitions measurements require an ultrastable control of the delay between pump (XUV) and probe (NIR). A novel non-interferometric delay line enables intrinsic delay synchronisation within a few attoseconds over several hours. Our unique coincidence spectroscopy setup will enable the investigation of electronic and coupled electronic-nuclear dynamics. Thus, shedding new light on the first instants of photoionization and subsequent nuclear dynamics in small size molecules.