Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.34: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Anisotropy of the K − CO normal interaction potential at 1 eV and activation energy of the (0→ 1) vibrational excitation of CO scattered by K — •Karsten Rott and Dieter Beck — Universität Bielefeld, Universitätsstasse 25, D-33615 Bielefeld
We analysed the anisotropy of the K − CO interaction potential at V ≈ 1 eV by performing scattering experiments with crossed molecular beams. The energetically and angularly resolved differential cross section was measured and the rotational inelastic scattering was simulated using the classical hard shell model. A shell shaped like an egg with its thin, more curved end in oxygen direction gives good results in comparison with experiment.
Vibrational excitation is found to set in as the (0 → 1) transition at the collision energy E = 1.0 eV . It is apparently caused by the avoided crossing of the X2 A′ and A2 A′ potentials of K − CO .
Comparing similar systems K − CO and K − N2 we also find very different, hitherto unexplained yields of vibrational excitation of the molecules and electronical excitation of K .