Heidelberg 2015 – scientific programme
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MO: Fachverband Molekülphysik
MO 14: Cold Molecules 2
MO 14.7: Talk
Wednesday, March 25, 2015, 16:15–16:30, PH/HS1
Low energy scattering of Stark-decelerated OH radicals with ortho- and para-H2 molecules — •H.C. Schewe1, X. Wang1, S. Y. T. van de Meerakker2, G. Meijer1,2, Q. Ma3, J. Klos3, P. J. Dagdigian3, M. H. Alexander3, A. v. d. Avoird2, and N. Vanhaecke1,4 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany. — 2Radboud University Nijmegen, Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, the Netherlands. — 3Department of Chemistry and Biochemistry and Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742-2021, USA. — 4Laboratoire Aime Cotton, CNRS, Universite Paris-Sud, 91405 Orsay, France.
The crossed beam scattering is an important experimental method to investigate molecular interactions, which can lead to energy transfer or chemical reactions. The Stark deceleration technique yields control over both the internal and external degrees of freedom of polar molecules in a molecular beam. The combination of these techniques opens up deeper investigations of molecular scattering processes as a function of the collision energy with a very high energy resolution.
Results on inelastic scattering of ortho- or para-H2 with Stark-decelerated OH(X 2Π3/2,J) = 3/2, f) at collision energies between 60-150 1/cm are presented. The main difference in the scattering process of ortho- and para-H2 is seen in the relative cross sections, originating from the different multipole interactions involved and are compared with theory.