Abstract
We have measured electron-circularly-dichroic asymmetries when longitudinally-polarized (chiral) electrons are scattered quasi-elastically by chiral halocamphor molecules: 3-bromocamphor (C10H15BrO), 3-iodocamphor (C10H15IO), and 10-iodocamphor. The proposed dynamic origins of these asymmetries are considered in terms of three classical models related to Mott scattering, target electron helicity density, and spin-other-orbit interactions. The asymmetries observed for 3-bromocamphor and 3-iodocamphor scale roughly as Z2, where Z is the nuclear charge of the heaviest atom in the target molecule, but the scaling is violated by 10-iodocamphor, which has a smaller asymmetry than that for 3-iodocamphor. This is in contrast to the asymmetries in the collision channel associated with dissociative electron attachment, in which 10-iodocamphor has a much larger asymmetry. All of the available electron-circularly-dichroic data taken to date are considered in an effort to systematically address the dynamical cause of the observed chiral asymmetries.
Highlights
L effects measured to date have involved molecules containing at least one atom with a relatively high atomic number ( 35) [2, 3]
Similar ‘electron dichroic’ effects were seen in electron-induced dissociative reactions (‘dissociative electron attachment’ or DEA) in 3-bromocamphor and 3- and 10iodocamphor [4, 5]
The chiral sensitivity of a given reaction channel is characterized by an asymmetry parameter a: a+
Summary
L effects measured to date have involved molecules containing at least one atom with a relatively high atomic number ( 35) [2, 3]. They are discussed here for transmission measurements in terms of simple classical pictures that explain why one direction of longitudinal electron spin is more likely to be scattered than the other [6–12].
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More From: Journal of Physics B: Atomic, Molecular and Optical Physics
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