New paper in Physical Review Research on two-photon double ionization driven by an HHG source accepted

We are happy to announce that a new paper has been accepted in Physical Review Research. The article describes our first results on non-linear photoioinzation in the XUV, driven by our high-harmonic generation source - a major step towards all-XUV pump-probe experiments in our laboratory. Further, a new preprint describes the source and our HHG beamline.

Achieving non-linear interactions in the extreme ultraviolet spectral range (XUV) at high repetition rate has been a long-standing goal on the route towards compact and lab-based XUV-XUV pump probe experiments. In our new article, we demonstrate this feat by presenting coincidence measurements of two-photon double ionization (TPDI) of argon at 26.5 eV photon energy. TPDI is a fundamental process of light-matter interaction in the extreme ultraviolet (XUV) that is not only non-linear but also involves electron correlations. This makes it particularly interesting for atomic physics and quantum science. In our paper, we study in detail the TPDI of argon in the presence of an autoionizing resonance, which opens an interesting pathway for double ionization, which involves pronounced electron-electron interactions.

Read our new paper “Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance”!

The XUV beamline is described in this arXiv preprint.