Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 4: Cold Molecules & Helium Droplets 1
MO 4.6: Vortrag
Montag, 29. Februar 2016, 15:45–16:00, f142
Feasibility of microwave manipulation and Stark deceleration of polyatomic asymmetric molecules — •Jack B. Graneek1, Simon Merz1, David Patterson2, Thomas Betz1, and Melanie Schnell1 — 1Max-Planck-Institut für Struktur und Dynamik der Materie, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Harvard University, Department of Physics, Cambridge, USA
Motion manipulation of large molecules or ground-state molecules requires methods that are compatible with high-field-seeking states. In inhomogeneous fields, molecules in high-field-seeking states experience a force towards the field maxima. However, true 3D field maxima cannot be realized in free space with static fields alone so time-dependent fields are required. In previous experiments, focusing and deceleration of ammonia molecules was achieved [1]. Ammonia was considered, to a good approximation, an isolated two-level system. We have performed numerical calculations to predict and develop microwave manipulation experiments for polyatomic asymmetric molecules. This approach goes beyond the two-level approximation often employed for simpler molecules, e.g. NH3 and acetonitrile [2], and is more broadly applicable. Trajectory simulations were carried out to predict microwave focusing measurements using a cylindrically symmetric microwave resonator. We also explore the potential for the Stark deceleration of specific rotational states of similarly complex systems that are low-field seeking up to a certain electric field strength.
[1] S. Merz et al., Phys. Rev. A 85, 063411 (2012).
[2] S. Spieler et al., Mol. Phys. 111, 1823–1834 (2013).