Anisotropic fragmentation in low-energy dissociative recombination
S. Novotny, H. Rubinstein, H. Buhr, O. Novotn\'y, J. Hoffmann, M.B., Mendes, D.A. Orlov, M.H. Berg, M. Froese, A.S. Jaroshevich, B. Jordon-Thaden,, C. Krantz, M. Lange, M. Lestinsky, A. Petrignani, I.F. Schneider, D. Shafir,, F.O. Waffeu Tamo, D. Zajfman, D. Schwalm, A. Wolf
TL;DR
This study investigates the anisotropic fragmentation patterns in low-energy dissociative recombination using a twin merged beam experiment, revealing energy-dependent angular distributions and higher-order anisotropies.
Contribution
It provides the first detailed analysis of higher-order angular dependences and rotational state contributions in dissociative recombination at low energies.
Findings
Anisotropy varies with collision energy.
Higher than second-order Legendre polynomial contributions were observed.
Slight anisotropy exists even at zero collision energy.
Abstract
On a dense energy grid reaching up to 75 meV electron collision energy the fragmentation angle and the kinetic energy release of neutral dissociative recombination fragments have been studied in a twin merged beam experiment. The anisotropy described by Legendre polynomials and the extracted rotational state contributions were found to vary on a likewise narrow energy scale as the rotationally averaged rate coefficient. For the first time angular dependences higher than 2 order could be deduced. Moreover, a slight anisotropy at zero collision energy was observed which is caused by the flattened velocity distribution of the electron beam.
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