Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 33: Poster VI

A 33.13: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent A

Towards Multidimensional XUV Spectroscopy Combined with Spectral Interferometry — •Lina Hedewig, Carlo Kleine, Alexander Magunia, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany

Using two infrared (IR) and two extreme ultraviolet (XUV) ultrashort pulses we are currently implementing a method for multidimensional XUV spectroscopy combined with spectral interferometry to gain further insight into gas-phase quantum dynamics of atoms and molecules.

The setup is based on a four quadrant split-and-delay mirror which allows independent time delay control of each beam with attosecond precision, similar to [1]. One XUV pulse excites an electronic wavepacket in the target generating a coherent dipole response. This wavepacket is strong-field coupled by the two intensity-tunable IR pulses, allowing selective control of state-specific quantum dynamics. Due to phase-matching requirements, the IR-modified response can be diffracted towards the remaining fourth beam, comparable to [2], and creates a nearly background-free signal, partially still overlapping with the initial XUV beam. Spatially resolving the signals in our XUV spectrometer, both collinear and non-collinear pathways are recorded. To additionally extract the phase of the dipole response, the second XUV beam serves as local oscillator for heterodyned spectral interferometry. The poster presents the experimental setup and first measurements.

[1] Zhang et al., Opt. Lett. 38, 356-358 (2013)

[2] Bengtsson et al., Nature Photon 11, 252-258 (2017)

Keywords: multidimensional XUV spectroscopy; spectral interferometry; state-specific quantum control