Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 6: Poster: Cold Molecules
MO 6.11: Poster
Montag, 14. März 2011, 16:00–18:00, P1
Low-energy scattering of Stark-decelerated OH radicals with He atoms at high energy resolution — •H. Christian Schewe, Moritz Kirste, Xingan Wang, Ludwig Scharfenberg, Janneke Blokland, Gerard Meijer, and Sebastiaan Y.T. van de Meerakker — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6,14195 Berlin, Germany
For precise collision studies of molecules, a Stark decelerator offers the advantage that it produces beams of cold neutral polar molecules with a tunable velocity. Crossed or merged with a second beam of atoms or molecules, scattering can be studied at collision energies down to few wavenumbers.
We present future experiments in which the inelastic scattering of Stark-decelerated and state-selected OH(X2Π3/2, J=3/2) radicals with Helium atoms will be studied (Kirste et al. Phys. Rev. A 82, 042717, (2010)). To reach collision energies down to 10 cm−1 a pulsed valve of the Even-Lavie type (Hillenkamp et al. J. Chem. Phys. 118, 8699, (2003)) is mounted on a Helium cryostat. The translational velocity and the speed ratio of a pure Helium beam have been characterized and its dependence on the temperature, the stagnation pressure and the opening time of the valve have been determined. Simulations will be presented to show how the resolution of the collision energy can be optimized such that theoretically predicted scattering resonances of the inelastic cross section can be resolved.