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Søren Vrønning Hoffmann

Chiral recognition in electron scattering by S- and R-2-butanol

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Experiments are described involving the low energy scattering of electrons from the two optical enantiomers S- and R- 2-butanol. Using a synchrotron radiation photoionization source on the ASTRID storage ring, scattering spectra are
reported between a few meV and 140 meV at an electron energy resolution of 1.6 meV. These data show electron dichroism at 35 meV, for scattering into the backward hemisphere, with a cross-section of 202.1±8.0 Å2 (4σ ) and 182.8±9.0 Å2 (4σ ) for S- and R- respectively, with the racemic mixture lying at the average value. No dichroic effect could be detected in the integral cross-section within the accuracy of the experiment. A brief qualitative discussion is given of a possible electron dissociative attachment mechanism for the creation of homochirality in space, including a new feature involving feedback through enhancement of electron polarization through scattering from non-racemic mixtures of enantiomers.
OriginalsprogEngelsk
TidsskriftMolecular Physics
Vol/bind113
Nummer15-16
Sider (fra-til)2197-2203
Antal sider7
ISSN0026-8976
DOI
StatusUdgivet - sep. 2015

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