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MO: Fachverband Molekülphysik
MO 21: Poster – Interaction with Strong or Short Laser Pulses (joint session A/MO)
MO 21.1: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Towards Multidimensional XUV Spectroscopy Combined with Spectral Interferometry — •Lina Hedewig1,2, Carlo Kleine1, Felix Wieder1,2, Christian Ott1,2, and Thomas Pfeifer1,2 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany
Using up to 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 allowing independent time delay control of each beam. In situ phase correction results in an effective interferometer stability of 1.5 attoseconds. One XUV pulse excites an electronic wave-packet in the target generating a coherent dipole response. This wave-packet is strongfield coupled by the two IR pulses, leading to control of state-specific quantum dynamics as well as the signal's diffraction towards the remaining fourth beam for a nearly background-free detection. To additionally extract the dipole response's phase, the second XUV beam serves as local oscillator for heterodyned spectral interferometry. The additional phase information compared to classical transient absorption opens up a plethora of possibilities like pulse reconstruction beyond the single-atom response, improved robustness against detector intensity noise and dipole reconstruction for short dipole lifetimes.
Keywords: multidimensional XUV spectroscopy; state-specific quantum control; spectral interferometry; dipole phase reconstruction