Session C5: Ion Collisions
2:00 PM–4:00 PM, Wednesday, May 20, 2009
Clark Hall Room: 107
Chair: David Schultz, Oak Ridge National Laboratory
Abstract ID: BAPS.2009.DAMOP.C5.8
Abstract: C5.00008 : Isotope Effects in Low Energy Ion-Atom Collisions
3:24 PM–3:36 PM
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Abstract 
Authors:
D.G. Seely
(Albion College)
C.C. Havener
(Oak Ridge National Laboratory)
R. Rejoub
(Oak Ridge National Laboratory)
Isotope effects for charge transfer processes have recently received increased attention Stolterfoht et al., PRL 99 (2007) 10301. The ion-atom merged-beams apparatus at Oak Ridge National Laboratory is used to measure charge transfer for low energy collisions of multi-charged atomic and molecular ions with H and D and is therefore well suited to investigate isotope effects. When charge transfer occurs at relatively large inter- nuclear distances (via radial couplings) the ion-induced dipole attraction can lead to trajectory effects, causing differences in the charge transfer cross sections for H and D. A strong isotope effect (nearly a factor of two) has been observed in the cross section for Si$^{4+}$ + H(D) below 0.1 eV/u. However, little or no difference is observed for N$^{2+}$ + H(D). Recently, strong effects have been predicted by Stolterfoht et al. for the fundamental system He$^{2+}$ + H(D,T) at collision energies below 200 eV/u where charge transfer occurs primarily through united-atom rotational coupling. We are currently exploring systems where rotational coupling is important and isotopic differences in the cross section can be observed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.DAMOP.C5.8