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MO: Fachverband Molekülphysik

MO 15: Femtosecond Spectroscopy IV

MO 15.5: Vortrag

Mittwoch, 20. März 2013, 12:15–12:30, F 102

Signatures of attosecond dynamics in molecular dissociation — •Jesse Klei, Christian Neidel, Chung-Hsin Yang, Lukas Medisauskas, Misha Ivanov, and Marc Vrakking — Max-Born-Institut, Berlin

We report on attosecond time-resolved XUV-IR pump-probe measurements, investigating the dissociative ionization of N₂. Angular resolved photoion measurements of the N⁺ fragments were performed using a velocity map imaging spectrometer (VMIS). The kinetic energy spectra of the fragment ions show a structure at low energies corresponding to the vibrational levels of the ionic C₂Σ_u⁺ state of N₂. The photoion yield of these vibrational energies show a clear oscillation as a function of the time delay between the attosecond pulse train (APT) and its infrared (IR) driving laser, with an oscillation period equal to half the IR laser cycle. The phase of the oscillations of the vibrational energy bands show clear jumps with respect to each other. We discuss how these results show the effect of attosecond electronic coherence in femtosecond molecular dynamics.