Investigating resonant low-energy electron attachment to formamide: dynamics of model peptide bond dissociation and other fragmentation channels
2020
We report experimental results on three-dimensional momentum imaging
measurements of anions generated via dissociative electron attachment to
gaseous formamide. From the momentum images, we analyze the angular and kinetic
energy distributions for NH$_2^{-}$, O$^{-}$, and H$^{-}$ fragments and discuss
the possible electron attachment and dissociation mechanisms for multiple
resonances for two ranges of incident electron energies, from 5.3~eV to 6.8~eV,
and from 10.0~eV to 11.5~eV. {\it Ab initio} theoretical results for the
angular distributions of the NH$_2^{-}$ anion for $\sim$6~eV incident
electrons, when compared with the experimental results, strongly suggest that
one of the two resonances producing this fragment is a $^2$A$''$ Feshbach
resonance.
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