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3. Multielectron removal processes in He2++Nacollisions

Author

Knoop, S., Hasan, V.G., Morgenstern, R.W.H., Hoekstra, R.A., and Research unit Astroparticle Physics

Subjects
CHARGED IONS, MOMENTUM SPECTROSCOPY, COLLISIONS, RECOIL-ION, MAGNESIUM, EXCITATION, PATHWAYS, SINGLE IONIZATION, EMISSION, MULTIPLE-ELECTRON-CAPTURE
Abstract

Multielectron processes have been studied by measuring the Na2+ and Na3+ recoil momenta resulting from 10 keV/amu He2++Na(3s) collisions. The Na2+ Q-value spectrum shows that transfer ionization dominates two-electron removal. Double capture populates mostly singly excited He(1snl) states. A smaller fraction of double capture leads to doubly excited He. Na3+ recoil ions are created by double capture into the He ground state and the emission of a third electron into the continuum. The Na3+ recoil ion is not left in its triplet ground state but in one of the low-lying excited singlet terms due to spin conservation.

Published
2006

6. Metastable dissociation of doubly charged ions produced from toluene: Kinetic energy release upon charge separation and H2 elimination

Author

Feil, S., Echt, O., Głuch, K., Hasan, V.G., Matt-Leubner, S., Tepnual, T., Grill, V., Bacher, A., Scheier, P., and Märk, T.D.

Subjects
*IONS, *INTERMEDIATES (Chemistry), *PROPERTIES of matter, *ORGANIC compounds
Abstract

Abstract: Doubly charged ions produced by electron impact ionization of toluene undergo metastable decomposition. We have determined decay channels for and the average kinetic energy release (KER) by applying the MIKE scan technique. We observe several reactions that have not been reported previously, including H2 elimination from . The KER distribution for H2 loss shows no evidence for a reverse barrier. The average KER is <0.1 eV; it exhibits a distinct time dependence and isotope effect. On the other hand, some charge separation reactions reported previously in the literature are likely due to isotopic interference. [Copyright &y& Elsevier]

Published
2005
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