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A: Atomphysik
A 4: Atomstösse
A 4.2: Talk
Tuesday, March 5, 2002, 14:15–14:30, HS 01/E02
Hot recoils from cold atoms — •Steven Knoop1, Jan Willem Turkstra1, Ronnie Hoekstra1, Reinhard Morgenstern1, and Ron Olson2 — 1KVI, Atomic Physics, Rijksuniversiteit Groningen, Zernikelaan 25, NL 9747 AA Groningen, The Netherlands — 2Physics Department, University of Missouri-Rolla, Rolla, MO 65401, USA
We present results on multiple-electron removal in collisions of He2+
ions on Na at 6 keV/amu impact energy. We use the new technique of MOTRIMS,
which combines recoil ion momentum spectroscopy and magneto-optical (atom)
trapping. This combination facilitates the measurement of the minute recoil
momenta of the target ions, which are linked to impact parameter and energy
gain or loss of the reaction processes. After demonstrating the versatility
of MOTRIMS on multiple-electron removal in O6+-Na collisions [1],
higher-resolution experiments were done on He2+-Na collisions. We have
measured not only single and double electron capture, but also the
unexpected creation of Na3+ ions. Direct ionization studies at such
low collision energies (v < 0.5 a.u.) have turned out to be very
difficult if not impossible. MOTRIMS offers a unique possibility to access
ionization related processes at low collision energies.
[1] J. W. Turkstra, R. Hoekstra, S. Knoop, D. Meyer, R. Morgenstern and R.
E. Olson, Phys. Rev. Lett. 87, 123202 (2001)