Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.15: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Motion manipulation of 4-aminobenzonitrile with microwave fields — •Jack Graneek, Simon Merz, Thomas Betz, and Melanie Schnell — Max-Planck-Institut für Struktur und Dynamik der Materie at the Center for Free-Electron Laser Science, 22761 Hamburg, Germany

To manipulate the motion of large and complex molecules, or molecules in their ground state it is necessary to employ methods that are compatible with high-field-seeking states. High-field-seeking states are attracted to field maxima, which cannot be realized in free space with static fields. Therefore, motion manipulation of such states requires the use of time-dependent fields. A previous experiment using microwave fields within a resonator achieved an additional deceleration of a pre-decelerated packet of ammonia molecules [1]. Here, we employ a modified experimental setup for the manipulation of a molecular beam of 4-aminobenzonitrile (ABN), a larger and heavier (118 g/mol) molecule, directly from a supersonic expansion. ABN displays a large dipole moment. It is an asymmetric top so also has a more complex rotational structure. In order to predict the AC Stark shift of the ABN rotational levels within our microwave resonator we have developed a numeric simulation. From this we can determine which rotational states are more accessible for focusing with a microwave lens. Here, we will present the results of calculations carried out as well as details on the new experimental set up.

[1] S. Merz, C. Brieger, N. Vanhaecke, G. Meijer, and M. Schnell, Mol. Phys. 111, 1855-1864 (2013).