Hannover 2020 – scientific programme

The DPG Spring Meeting in Hannover had to be cancelled! Read more ...

Parts | Days | Selection | Search | Updates | Downloads | Help

A: Fachverband Atomphysik

A 2: Attosecond physics I

A 2.6: Talk

Monday, March 9, 2020, 12:30–12:45, f107

Two-Color time resolved photoionization experiments with a high-repetition rate laser — •Hemkumar Srinivas, Farshad Shobeiry, Divya Bharti, Anne Harth, Thomas Pfeifer, and Robert Moshammer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117

Photoionization in atoms and molecules have long been used to study the atomic/ molecular structure. With the advent of ultrashort laser pulses in the femtosecond and attosecond time-scale, it has been possible to observe dynamics at the atomic level in real time.

This is done with the help of a pump-probe scheme wherein the initial laser pulse excites or ionizes the system and this is followed by another pulse with a precise time delay that helps mapping the phase of the emitted electron wavepacket.

In this work, we implement an XUV-IR pump-probe technique called RABBIT[1] to understand and observe electron dynamics in Noble gases and simple molecular systems such as diatomic molecules. Of particular interest is to investigate the effects of the intensity of the probing infrared field on the electron in the continuum and how it affects the angular distribution for the electron emission. The usage of a high-repetition rate laser reduces the acquisition time significantly, thereby making it easier to investigate processes with a relatively low ionization cross-section in a shorter timeframe.

Reference : [1] PM Paul et. al, Science(292) 5522