Bonn 2000 – scientific programme

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MO: Molekülphysik

MO 14: Poster I: Reaktive Stöße

MO 14.1: Poster

Wednesday, April 5, 2000, 10:30–13:00, Aula

Double-differential cross section in the reaction Li + HF → LiF + H — •Olaf Höbel and Hansjürgen Loesch — Fakultät für Physik, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany

Angular and time-of-flight distributions of the products formed

in the reaction Li + HF → LiF + H have been measured

in a crossed beam experiment for various energies ranging from

120 to 360 meV. From these data we have deduced the

double-differential cross-section in the center-of-mass frame

using the technique of fixed velocity transformation. All the

measurements exhibit preferred forward scattering of the

products LiF. With decreasing energy a backward peak occurs

which reaches at 120 meV 50% of the height of the forward

one. The forward/backward peak ratio deviates from the findings

of an earlier experimental work¹. Our results are in fair

agreement with quasiclassical trajectory (QCT) calculations²

based on the potential energy surface (PES) of Aguado et

al.³. QCT studies² using the PES of Lagana et al.⁴

are at variance with our results.

1) H. Becker et al., J. Chem. Phys. 73 (1980) 2833

2) A. Aoiz et al., Chem. Phys. Letters 299 (1999) 25

3) A. Aguado et al., J. Chem. Phys. 107 (1997) 10085

4) A. Lagana et al., J. Phys. Chem. 99 (1995) 11696