MBI Colloquium
Wednesday, 17. April 2024 // 14.00 -
Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy
Max-Born-Straße 2a,
12489 Berlin
Max Born Hall
Interferometry on extreme time and wavelength scales
Dr. Tim Laarmann | DESY Hamburg
Short-pulse metrology and dynamic studies in the extreme ultraviolet spectral range greatly benefit from interferometric measurements. In recent years my research team has developed a Michelson-type all-reflective split-and-delay autocorrelator operating in a quasi-amplitude splitting mode [1]. The common-path interferometer opens up new opportunities for short-wavelength femtosecond and attosecond pulse metrology and dynamic studies on extreme time scales in various research fields [2]. In my talk I will discuss a few examples from atomic [3] and molecular physics [4], where the experiments provide information on time-dependent electronic structure. Here, the coupling of electronic and nuclear degrees of freedom in polyatomic molecules during charge motion is an important aspect [5]. I will show that the detailed analysis of amplitude, instantaneous phase and instantaneous frequency of the propagating many-body wave packet during its lifecycle provides unprecedented insight into dynamical processes in complicated, but ubiquitous, non-Born-Oppenheimer photochemical conditions [6].
[1] S. Skruszewicz et al., Opt. Express 29, 40333 (2021).
[2] S. Usenko et al., Nature Communications 8, 15626 (2017).
[3] S. Usenko et al., J. Phys. B 53, 244008 (2020).
[4] D. Schwickert et al., Science Advances 8, eabn6848 (2022).
[5] D. Schwickert et al., Struct. Dyn. 9, 064301 (2022).
[6] D. Schwickert et al., J. Phys. Chem. A 128, 989-995 (2024).