TY  - GEN
N2  - Within this thesis, molecular dynamics of diatomic molecules is studied using the XUV?IR pump?probe technique. Here, a single extreme ultraviolet (XUV) photon created by high-harmonic generation ionizes the diatomic target molecule. The initiated dynamics is probed after a variable time delay by an ultrashort (12 fs) infrared (IR) laser pulse. The 3-dimensional momenta of all charged fragments are measured using a reaction microscope.
In an experiment on O_2, a nuclear wave-packet oscillation is observed on the binding potential-energy curve (PEC) of the O_2^+(a ^4?_u) electronic state. By comparing
simulated results with experimental data, theoretically predicted PECs are tested. The experimental results are best reproduced if the wave packet is propagated on a
Morse potential adjusted to the experimental data. This demonstrates the sensitivity of our method and its ability to predict accurate PECs from the measured wave-packet
evolution.
In an N2 experiment, the pump?probe delay dependent yield of stable N_2^+ is observed. It is interpreted as a sequential double ionization via a highly excited antibonding cationic state. The dissociation of the intermediate state is temporally resolved and can be interrupted by multi-photon ionization with the IR pulse within ? 15 fs after XUV ionization.
TI  - Tracing ultra-fast molecular dynamics in O_2^+ and N_2^+
with XUV?IR pump?probe experiments
Y1  - 2015///
A1  - Cörlin, Philipp
AV  - public
ID  - heidok19644
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/19644/
ER  -