München 2004 – wissenschaftliches Programm
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MO: Molekülphysik
MO 18: Stossprozesse, Energietransfer
MO 18.3: Vortrag
Donnerstag, 25. März 2004, 17:00–17:15, HS 355
The dependence of the differential cross section for Li+HF→LiF+H on the rotational state of HF — •Rolf Bobbenkamp1, Alessandra Paladini2, Andrea Russo2, and Hansjürgen Loesch2 — 1Dipartimento di Chimica , Universita’ di Perugia , 06123 - PERUGIA , Italy — 2Fakultä für Physik, Universit"t Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld
Quantum and quasi classical studies have shown that the j-specific differential cross section of the title process depends strongly on the rotational state (j) of HF with respect to both shape and magnitude. Based on these results we simulated the experimentally accessible j-averaged cross sections for various j-distributions of the HF molecule and found significant effects. In a crossed molecular beam experiment we have now examined these predictions.
We measured angular distributions of the reaction product LiF of the title reaction at several collision energies ranging from 130 to 350 meV for various rotational temperatures of the HF nozzle beam. We observe both a significant increase of the product intensity with the temperature and a change of the shape. Calculations are being performed to allow a quantitative comparison of the experimental results with theoretical predictions based on various recent ab-initio potential energy surfaces.