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A: Fachverband Atomphysik

A 6: Interaction of matter with ions

A 6.1: Talk

Tuesday, March 11, 2008, 08:30–08:45, 3D

A MOTRIMS experiment on the energy dependence of double electron transfer — •Ina Blank¹, Simone Götz¹, Terry Mullins¹, Wenzel Salzmann¹, Roland Wester¹, Matthias Weidemüller¹, Valeriu Gabriel Hasan², Reinhard Morgenstern², and Ronnie Hoekstra² — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herder Str. 3, 79104 Freiburg, Germany — ²KVI - Atomic Physics, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands

We present the first results on the energy dependence of state-selective double-electron capture in ion-alkali collisions. Experiments are performed with an O⁶⁺ projectile beam, passing through a cloud of sodium atoms, stored in a magneto-optical trap. State resolved double electron transfer is observed by detecting Na²⁺ ions using Recoil-Ion-Momentum-Spectroscopy [1]. Laser cooling of target atoms ensures high momentum resolution due to low initial thermal momenta. Projectile ion energies are varied from 4.5 to 8.6 keV/amu. Recoil momenta of Na²⁺ ions reveal double transfer of outer and inner shell target electrons, principally into 3ln’l’ states of the downcharged projectile [2]. Due to the short interaction times for transfer into 3l3l’ states, double transfer into this channel is expected to occur simultaneously which suggests that coherent multi-particle correlations may be investigated via this process.
J. W. Turkstra et al., Phys. Rev. Lett. 87, 123202 (2001).
S. Knoop et al., Europhys. Lett., 74, 992, (2006)