Heidelberg 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 16: Posters 3: Novelties in Molecular Physics
MO 16.16: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
A new setup for merged-beam ion-neutral collision studies — Pitt Allmendinger, •Johannes Deiglmayr, Joseph Agner, Hansjürg Schmutz, and Frédéric Merkt — Laboratory of Physical Chemistry, ETH Zürich, Switzerland
Collisions between atoms or molecules in Rydberg-Stark states and atoms or molecules in the ground state can yield important information about the corresponding ion-neutral reaction: the Rydberg electron in the Rydberg-Stark states is almost entirely decoupled from the ion core and orbits around it at distances much larger than those at which typical ion-molecule reactions take place. Consequently, it does not influence the outcome of an ion-molecule reaction [1].
Recently we have demonstrated the simultaneous deceleration and deflection of H2 molecules in Rydberg states following supersonic expansion from a reservoir at liquid-nitrogen temperature [2], yielding cold (T=100 mK) samples of H2* molecules with tunable velocities. The combined decelerator and deflector is realized by a 50mm long two-dimensional array of electrodes on a printed circuit board which is bend to a deflection angle of 10∘. We have integrated the device into a merged-beam setup, and observe the formation of H3+ ions from the collisions between H2 ground-state and H2 Rydberg molecules.
[1] S. T. Pratt, J. L. Dehmer, P. M. Dehmer, and W. A. Chupka, J. Chem. Phys. 101, 882 (1994); [2] P. Allmendinger, J. Deiglmayr, J. A. Agner, H. Schmutz, and F. Merkt, Phys. Rev. A 90, 043403 (2014)