Low-energy electron attachment to SF₆ molecules: Vibrational structure in the cross-section for SF₆⁻ formation up to 1 eV

Braun, M.; Ruf, M.-W.; Hotop, Hartmut; Allan, Michael

doi:10.1016/j.cplett.2005.12.005

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Journal article

Low-energy electron attachment to SF₆ molecules: Vibrational structure in the cross-section for SF₆⁻ formation up to 1 eV

Braun, M. Fachbereich Physik, Technische Universität Kaiserslautern, Germany
Ruf, M.-W. Fachbereich Physik, Technische Universität Kaiserslautern, Germany
Hotop, Hartmut Fachbereich Physik, Technische Universität Kaiserslautern, Germany
Allan, Michael Chemistry Department, University of Fribourg, Switzerland

2006

Published in:

Chemical Physics Letters. - 2006, vol. 419, no. 4-6, p. 517-522

English In high resolution electron attachment to SF₆, cusp structure due to interchannel coupling has been observed in the cross-section for SF₅⁻ formation at the thresholds for vibrational excitation of the SF₆(v₁) mode up to v₁ = 10. It is superimposed on the broad band peaking around 0.55 eV which has been previously attributed to attachment into a repulsive potential surface and subsequent direct dissociation. The newly observed vibrational structure as well as electron energy loss spectra (which exhibit strong excitation of the v₁ mode up to high quantum numbers) indicate, however, that both the channel yielding the long-lived SF₆⁻ anions and the dissociative SF₅⁻ + F channel have a common primary attachment process, mediated by the same SF₆⁻ scattering state and strongly coupled to the process of vibrational excitation.

Faculty

Faculté des sciences et de médecine

Department

Département de Chimie

Language