Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Poster 1: Cluster, Femtosecond Spectroscopy
MO 14.21: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
Attosecond molecular dynamics — •Jesse Klei, Christian Neidel, Chung-Hsin Yang, Lukas Medisauskas, Martin Galbraith, Misha Ivanov, and Marc Vrakking — Max-Born-Institut, Berlin
Ultrafast molecular dynamics have been investigated by employing an XUV-IR pump-probe scheme. We probe the electron-electron or electron-nuclear correlations on their natural attosecond timescale by varying the time delay between the pump and probe pulses with attosecond precision. The XUV radiation consists of a train of attosecond pulses (APT) that are generated by the process of high harmonic generation (HHG). Using a velocity map imaging spectrometer (VMIS), angular resolved photoion and photoelectron measurements are performed.
We report experiments, where the time-dependent polarization of neutral molecules (N2, CO2 and C2H4) under the influence of a moderately strong near-infrared laser field is monitored with attosecond time resolution, showing pronounced oscillations with a half IR cycle period in the parent molecular ion yield as a function of the pump-probe delay. Furthermore, investigations into the dissociative ionization of N2 are discussed. We show that the kinetic energy spectra of the N+ fragment have a structure at low energies corresponding to the vibrational levels of the ionic C2Σu+ state of N2. Clear half IR cycle period oscillation of the N+ yield can be seen in this energy range due to the effect of attosecond electronic coherence in femtosecond molecular dynamics.