Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics: Femtosecond Spectroscopy, Quantum Control, Electronic Spectroscopy, Biomolecules and Photochemistry

MO 11.1: Poster

Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof

Relaxation and dissociation dynamics of XUV induced wavepackets in polyatomic molecules — •Geert Reitsma, Martin Galbraith, Lorenz Drescher, Johan Hummert, Marc Vrakking, Oleg Kornilov, and Jochen Mikosch — Max-Born-Institut, Berlin, Germany

The combination of ultrafast science with advanced spectroscopic techniques, like mass spectrometry, velocity map imaging, and transient absorption spectroscopy, offers an excellent opportunity to gain knowledge on relaxation and dissociation dynamics in polyatomic molecules. However, in ultrafast science, one always has to reach a compromise between the optimal spectral and the optimal temporal resolution. At the same time this also triggers an intriguing question: To which extent does the coherence of the excitation process influence the molecular response? To address this question, we employ two HHG beamlines: one attosecond beamline providing <5fs time resolution with an intrinsically broad spectrum, and one monochromator beamline providing a 300 meV spectral resolution with a 30fs time-resolution. The attosecond beamline was used to measure photodissociation timescales of methyliodine and iodobenzene by means of transient absorption spetroscopy, mainly making use of the broad spectrum of the ultrashort XUV-pulses. We measured non-adiabatic relaxation timescales of electron-correlation states in benzene and polycyclic aromatic hydrocarbons by means of time-resolved mass spectrometry. The monochromator beamline will be employed to obtain complementary data for selected harmonics.