We have constructed an apparatus combining the experimental techniques of cold target recoil ion momentum spectroscopy and a laser cooled target. We measure angle differential cross sections in Li(+)+Na-->Li+Na(+) electron transfer collisions in the keV energy regime with a momentum resolution of 0.12 a.u. yielding an order of magnitude better angular resolution than previous measurements. We resolve Fraunhofer-type diffraction patterns in the differential cross sections. Good agreement with predictions of the semiclassical impact parameter method is obtained.
We measure angle differential cross sections (DCS) in Li+ + Na → Li + Na+
electron transfer collisions in the 2.7–24 keV energy range. We do this
with a newly constructed apparatus which combines the experimental
technique of cold target recoil ion momentum spectroscopy with a laser-cooled
target. This setup yields a momentum resolution of 0.12 au, an order of
magnitude better angular resolution than previous measurements on this
system. This enables us to clearly resolve Fraunhofer-type diffraction
patterns in the angle DCS. In particular, the angular width of the ring
structure is given by the ratio of the de Broglie wavelength λdB = 150 fm at a
velocity v = 0.20
au and the effective atomic diameter for electron capture 2R = 20 au.
Parallel AO and MO semiclassical coupled-channel calculations of the Na(3s, 3p)
→
Li(2s, 2p) state-to-state collision amplitudes have been performed, and quantum
scattering amplitudes are derived by the eikonal method. The resulting
angle-differential electron transfer cross sections and their diffraction patterns
agree with the experimental level-to-level results over most scattering angles in
the energy range.
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