Erlangen 2018 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
A: Fachverband Atomphysik
A 31: Strong laser fields - II
A 31.1: Invited Talk
Wednesday, March 7, 2018, 14:00–14:30, K 2.019
H2+ and HeH+: Two fundamentally important molecules in strong laser fields — Philipp Wustelt1, Max Möller1, A. Max Sayler1,2, and •Gerhard G. Paulus1,2 — 1Friedrich Schiller University, Jena, Germany — 2Helmholtz Institute Jena, Germany
Ion beam experiments studying the fragmentation of HeH+ and H2+ are performed and compared. The two molecules represent extreme instances of polar and non-polar molecules. Therefore, the behavior of most chemical bonds in strong fields can be expected to lie in between these extremes.
In the experiment, the fragments generated through the interaction with femtosecond laser pulses of wavelengths from 400 to 2400 nm and intensities up to 1017 W/cm2 are recorded on a position- and time-sensitive detector such that the momenta of the fragments can be fully reconstructed.
The excitation and ionization dynamics in H2+ and HeH+ is very different, particularly at low intensities. In the former, dissociation is strong and the molecule stretches due to coupling of electronic states before ionization. HeH+, in contrast, can directly be vibrationally excited for sufficiently long wavelengths. Dissociation, on the other hand, is almost negligible for short wavelengths.