Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 26: Poster Session II
A 26.41: Poster
Wednesday, March 8, 2017, 17:00–19:00, P OG1
(e, 2e + ion) study of electron-impact ionization and fragmentation of tetrafluoromethane at low energies (E0 =35.7 eV, 38 eV, 45 eV and 67 eV) — •Khokon Hossen1,3, Xueguang Ren1, S. V. K. Kumar2, and Alexander Dorn1 — 1Max Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany — 2Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India — 3University of Santiago de Compostela,15782 Santiago de Compostela, Spain
We present our recent results for the ionization and fragmentation dynamics of tetrafluoromethane (CF4) molecules induced by low-energy electron impact (E0 = 35.7 eV, 38 eV, 45 eV, and 67 eV). One goal of this experiment is to clarify the origin of a resonance structure for the CF2+ fragment channel around 36 eV impact energy. Experimentally, we use a reaction microscope and a pulsed photoemission electron beam [1]. The momentum vectors of the two outgoing electrons (energies E1, E2) and one fragment ion are detected in triple coincidence (e, 2e + ion). After dissociation, the fragment products from CF4 are CF3+, CF2+, CF+, F+ and C+. For all fragmentation channels, we observe the ionized orbital binding energy (BE) [E0 - E1 - E2], the kinetic energy release (KER) of the fragments and two-dimensional (2D) correlation map between BE and KER. E.g., from binding energy spectra, we can conclude which molecular orbitals are responsible to form the fragments of CF4. [1] X. Ren et al, J. Chem. Phys. 141 134314 (2014).