Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques
MO 13.7: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Rotational-dynamics studies of state-selected molecules — •Jens S. Kienitz1, 2, Sebastian Trippel1, Terence G. Mullins1, Nele L. M. Müller1, and Jochen Küpper1, 2, 3 — 1Center for Free-Electron Laser Science, DESY — 2Center for Ultrafast Imaging, University of Hamburg — 3Department of Physics, University of Hamburg
State-selected, strongly aligned and oriented molecular ensembles serve as ideal samples to image ultrafast chemistry in the molecular frame, for instance, through molecular-frame photo-electron angular distributions or electron- or x-ray diffraction. We developed advanced techniques to manipulate the motion of molecules in cold supersonic beams at a kHz repetition rate [1]. State-, conformer-, and size-selection of neutral molecules was achieved through the dispersion of the molecular beam in the electric deflector. The state-selected molecules were laser aligned or mixed-field oriented in laser and static electric fields. We demonstrated strong alignment as well as mixed-field orientation for different molecular samples up to a 1 kHz repetition rate. We investigated the effects of widely varying pulse laser durations (50 fs to 500 ps), reaching from the impulsive regime to the adiabatic regime, which allowed us to disentangle previous experimental approaches. So far unobserved details of the intricate rotational dynamics were observed in the intermediate regime, e.g., for laser pulses on the order of the rotational period of the molecules.
[1] S.Trippel et al., Mol. Phys., 111, 1738 (2013)