Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.9: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Fraunhofer diffraction of matter waves — •M. van der Poel1, C.V. Nielsen1, M.-A. Gearba1, S.E. Nielsen2, and N. Andersen1 — 1Niels Bohr Institute, Ørsted Laboratory, DK-2100 Copenhagen Ø, Denmark — 2Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
We have constructed an apparatus combining the experimental techniques of cold target recoil-ion momentum spectroscopy (COLTRIMS) and a laser-cooled target. We measure angle differential cross sections in Li+ + Na(3s,3p) → Li(2s,2p) + Na+ electron transfer collisions in the keV regime with a recoil momentum resolution of 0.12 a.u. This yields an order of magnitude better angular resolution than previous measurements. The Li(2s) de Broglie wavelength is about 150 fm and the effective Na(3s) diameter 20 a.u. This results in a clearly resolved Fraunhofer type diffraction scattering pattern. Also, our coupled-channel calculations using a 35-state two center AO basis set compare very well with the experimental results. We consider the present results a crucial step towards COLTRIMS studies of anisotropic Na(3p) excited states.