Stuttgart 2012 – scientific programme
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MO: Fachverband Molekülphysik
MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics
MO 14.22: Poster
Wednesday, March 14, 2012, 16:30–19:00, Poster.IV
The electric deflector – a state selector for complex molecular systems — Yuan-Pin Chang1, Sebastian Trippel1, •Zeinab Eskandarian1, Terence G. Mullins1, Stephan Stern1, Lotte Holmegard1, Karol Długołȩcki1, and Jochen Küpper1,2 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2University of Hamburg
Size and state selection of molecules by means of electric deflection is an important, recently rejuvenated topic in molecular beam studies. The force exerted on a neutral polar molecule by an inhomogeneous electric field can be exploited to spatially separate quantum states due to their individual effective dipole moments. This state-selection has been used to experimentally create extremely polar samples for alignment and orientation control, as well as for the separation of structural isomers of complex molecules. In this contribution we will discuss the optimal shape of the device regarding its selectivity.
We will discuss the already obtained as well as the potential selectivity on a theoretical and experimental investigation of the separation of a single species from a cluster coexpansion of water and indole, resulting in a modestly cold beam (∼5 K) of water, indole, indole(H2O) and indole(H2O)n (n≥2). Specifically, we have created a pure sample of the indole-water 1:1 complex using the Chamberlain deflector design. We evaluate (computationally) the improvements in the selectivity – for this and other species from the expansion – that are possible using improved mechanical designs.