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MO: Fachverband Molekülphysik

MO 10: XUV-spectroscopy

MO 10.1: Talk

Wednesday, March 16, 2022, 10:30–10:45, MO-H6

Attosecond pump-probe coincidence spectroscopy of small molecules at 100 kHz — •Mikhail Osolodkov, Tobias Witting, Federico J. Furch, Felix Schell, Claus Peter Schulz, and Marc J. J. Vrakking — Max Born Institute, Berlin, Germany

It is advantageous to perform attosecond photoionization experiments in molecules with coincidence detection, since it allows resolving particular photoionization channels, such as dissociative channels. Here we report on experiments done at a beamline combining a table top high order harmonic generation (HHG) based extreme ultraviolet (XUV) laser pulse source operating at 100 kHz [1] with a reaction microscope [2], being recently commissioned. A noncollinear optical parametric chirped pulse amplification system (NOPCPA) operating at 800 nm central wavelength [3] serves as a driver. Both XUV attosecond pulse trains (APTs) [1], as well as isolated attosecond pulses (IAPs) are available for attosecond pump-probe experiments with a near infrared (NIR) probe. Employing the coincidence capabilities, the photoionization dynamics corresponding to the predissociative C state of the molecular nitrogen ion was studied state selectively using the RABBIT (reconstruction of attosecond beating by interference of two-photon transitions) technique with short XUV APTs and approximately 7 fs FWHM NIR pulses.

[1] M. Osolodkov et al., J. Phys. B: At. Mol. Opt. Phys.(2020)

[2] Sascha Birkner, PhD thesis, Freien Universität Berlin (2015)

[3] Federico J. Furch et al., Optics Letters (2017)