Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 9: Poster: Collisions, Energy Transfer
MO 9.4: Poster
Dienstag, 9. März 2010, 16:00–18:30, Lichthof
Differential cross section of the reactive collision O(1D)+D2: A 3D Velocity Mapping study — •S. Kauczok, C. Maul, and K.-H. Gericke — Institut für Physikalische und Theoretische Chemie, TU Braunschweig
For measuring the full double differential cross section of a reactive collision, reactant preparation with defined initial velocities and quantum states in number densities high enough to achieve acceptable count rates, but low enough to prevent secondary collisions, is - alongside the technique for final product velocity measurement - most important.[1]
We present a method for measuring the differential cross section of photo-initiated reactions employing only one molecular beam. Both, one reactant and the precursor of the other reactant are present in the same molecular beam and the center of mass velocity is selected by shifting the dissociation and the detection laser in time and space. Like in analogous measurements with crossed molecular beams using REMPI spectroscopy for product detection, this produces a bias in the measured velocity distribution due to the fact that the reaction takes place in the whole volume surrounding the laser beams. This fact is taken into account by a forward convolution analysis and backward code based on probabilistic considerations designed by us.
In order to demonstrate the applicability of this technique, we have re-investigated the well-studied reaction of O(1D) with D2.
[1] S. Kauczok, N. Gödecke, A. Chichinin, M.Veckenstedt, C. Maul, K.-H. Gericke, Rev. Sci. Instr. 80, 083301 (2009); A. Chichinin, S. Kauczok, K.-H. Gericke, C. Maul, Int. Rev. Phys. Chem. 28, 607 (2009)