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Strong-field effects on singly excited vibronic resonances in the hydrogen molecule.


Barber Belda,  Paula
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Barber Belda, P. (2022). Strong-field effects on singly excited vibronic resonances in the hydrogen molecule. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-000B-51A1-3
Studies of the hydrogen molecule interacting with ultrashort laser pulses allow for the
understanding of many molecular quantum phenomena in the simplest possible molecule.
In a transient-absorption experiment with H2 in the spectral range 13-17eV, transitions
from the molecular ground state to the electronically excited B, C and D states are driven
by extreme-ultraviolet (XUV) light, and a second near-infrared (NIR) laser is then used
to access other dark states. The aim of this project is to implement the simplest possible
multi-level simulation based on light-matter interaction theory which can already
reproduce the experimental results, and understand with it the importance of different
excited-state couplings to the changing absorption features. The included energy levels
of the eigenstates of H2 are calculated numerically, as well as the dipole matrix elements
for the considered transitions. Intensity-dependent changes in the XUV absorption spectrum
in the presence of a moderately strong NIR field are observed, as well as changes
in the revival time of the simulated wavepacket of the D states. In order to obtain Fano
line-shaped resonances, different implementations of a predissociating continuum are
examined. And finally, the effects introduced by a changing time delay between the two
pulses are studied.