Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 22: Poster – Attosecond Physics (joint session A/MO)
A 22.7: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 1. OG
Building a high-resolution XUV attosecond transient absorption spectrometer to observe time-dependent effects in atoms and molecules — •Noah L. Wach1, Gergana D. Borisova1,2, Christian Ott1, and Thomas Pfeifer1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden
Attosecond transient absorption spectroscopy (ATAS) has been extensively used to observe ultrafast electronic as well as vibrational dynamics in atoms and molecules[1,2]. Here, a combination of intense NIR femtosecond pulses, together with a high-harmonic-generated XUV pulse derived from them, is used to probe and control the systems quantum dynamics. We develop a new experimental setup, SHARP-XUV, which combines a conventional ATAS setup with a high-resolution XUV spectrometer in a Rowland configuration featuring a 3-meter arm length. This design is aimed to obtain an energy resolution of more than 10 000. Together with a time resolution of about a hundred attoseconds, we will be able to observe the complex dynamics where electronic or vibrational resonances lie extremely close and are hard to resolve with conventional XUV spectrometers. This setup will enable us to study the laser control of the overlapping series of highly doubly excited helium states as well as the laser-driven dynamics of increasingly closely spaced transitions near an ionization threshold.
[1] C. Ott et al., Nature 516, 374-378 (2014)
[2] G. Borisova et al., Phys. Rev. Research 6, 033326 (2024)
Keywords: Time-resolved; Spectrometer; XUV; High-Harmonic-Generation; High-resolution