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MO: Fachverband Molekülphysik

MO 22: Posters 3: Cluster, Strong Field Physics, and Experimental Techniques

MO 22.12: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Foyer LLM

Strong field ionization probing of (NO₂)₂ intermolecular vibration with ion coincidence imaging — •Lucia Merkel, Katrin Reininger, Jingming Long, Marc J. J. Vrakking, Federico Furch, Claus Peter Schulz, and Jochen Mikosch — Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin

The intermolecular vibration of the NO₂ dimer has attracted considerable attention in the attosecond community.^[1,2] Collective vibrational excitation of a gas sample can be achieved via impulsive stimulated Raman scattering.

Here we report on a pump-probe study of the O₂N-NO₂ vibration in which the probing step is conducted via strong field ionization. The sub-8 fs laser pulses used for the experiment are produced by a high repetition rate OPCPA system.^[3] The resulting ions are detected with coincidence velocity mapping, employing three-dimensional (x, y, t) data acquisition with a digital pixelated detector based on the Timepix technology.^[4] To increase the time resolution, the ion time-of-flight is additionally recorded with a high-resolution time-to-digital converter. We present the data analysis, which allows us to characterize the different pathways in which NO₂⁺ fragments are produced. Dissociative strong field ionization to the repulsive Ag state is utilized to characterize the vibrational motion in the ground state of (NO₂)₂.

[1] Li et al., Science, 322, 5905 (2008).

[2] Spanner et al., Phys. Rev. A, 85, 3 (2012).

[3] Furch et al., Opt. Express, 24, 19293 (2016).

[4] Long et al., J. Chem. Phys., 147, 013919 (2017).