Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 11: Attosecond physics II

A 11.4: Talk

Tuesday, March 10, 2020, 15:00–15:15, f107

Study of multiphoton transition in the continuum using RABBITT — •Divya Bharti, Farshad Shobeiry, Hemkumar Srinivas, Robert Moshammer, Thomas Pfeifer, and Anne Harth — Max Planck institut für Kernphysik, Heidelberg, Germany

Rapid advancement in the laser technology has made it possible to generate high power few-cycle Infrared (IR) pulses suitable for the generation of tabletop XUV radiation. These developments have made the study of attosecond physics accessible. Photoionization is a fundamental process in light-matter interaction. The photoelectrons released in this process carry information about the detection method as well as the electronic structure of the original atom.

We study single-photon ionization followed by multiphoton continuum-continuum (CC)-transitions in a RABBITT [1] like setup. RABBITT(Reconstruction of Attosecond beating by Interference of Two-Photon Transitions) is a widely used XUV-NIR pump-probe technique to study photoionization time delays. The presence of an IR (probe) field leads to the appearance of sidebands in the photoelectron spectra. These sidebands oscillate as the delay between XUV (pump) and IR field varies. We analyze the variation in the modulation of the sidebands with respect to e.g. the IR (probe) intensity or the probe frequency to analyze and study the effect of multiphoton transition. This technique will allow us to access the phases of CC-transition matrix elements [2].

[1] Muller, H. Appl Phys B (2002) 74

[2] Harth et al., Phys. Rev. A 99, 023410