Spin-dependent electron scattering from optically active molecules

Campbell, D. Murray; Faragó, Péter

doi:10.1038/318052a0

Cited by 59 publications

(25 citation statements)

References 9 publications

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“…In analogy to the differential absorption of polarized light by chiral molecules in optical dichroism experiments, the differential scattering of polarized electrons has been termed electron dichroism. In particular, Farago and co-workers 8,16,17 instigated the study of electron scattering from D/L-camphor molecules and found small effects in the electron polarization and beam attenuation for scattered electrons. Later, Mayer and Kessler verified the existence of electron dichroism in bromocamphor with asymmetries around 1 in 10 4 .…”

Section: Introductionmentioning

confidence: 99%

Chiral electron transport: Scattering through helical potentials

Yeganeh¹,

Ratner²,

Medina³

et al. 2009

The Journal of Chemical Physics

181

172

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We present a model for the transmission of spin-polarized electrons through oriented chiral molecules, where the chiral structure is represented by a helix. The scattering potential contains a confining term and a spin-orbit contribution that is responsible for the spin-dependent scattering of electrons by the molecular target. The differential scattering cross section is calculated for right- and left-handed helices and for arbitrary electron spin polarizations. We apply our model to explain chiral effects in the intensity of photoemitted polarized electrons transmitted through thin organic layers. These are molecular interfaces that exhibit spin-selective scattering with surprisingly large asymmetry factors as well as a number of remarkable magnetic properties. In our model, differences in intensity are generated by the preferential transmission of electron beams whose polarization is oriented in the same direction as the sense of advance of the helix. This model can be easily extended to the Landauer regime of conductance where conductance is due to elastic scattering, so that we can consider the conductance of chiral molecular junctions.

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Section: Introductionmentioning

confidence: 99%

Chiral electron transport: Scattering through helical potentials

Yeganeh¹,

Ratner²,

Medina³

et al. 2009

The Journal of Chemical Physics

181

172

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“…Chiral asymmetries were first observed in gas-phase electron-molecule collisions by the Münster group in 1995 for quasielastic scattering [3][4][5] (but, see also Refs. [6,7]). A number of interesting experiments done since then have involved the transmission of polarized electrons through solid chiral films [8][9][10].…”

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confidence: 99%

Anomalously Large Chiral Sensitivity in the Dissociative Electron Attachment of 10-Iodocamphor

Dreiling

Lewis

Mills³

et al. 2016

Phys. Rev. Lett.

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“…Campbell & Farago measured the transmission of spin-polarized 5 eV electrons through the left-and right-handed isomers of camphor vapour (Campbell & Farago, 1985. They found a relative difference near to io~2 in the transmission of the electrons polarized to 28 % through the isomers.…”

Section: Vester-ulbricht Processmentioning

confidence: 99%

Origin of the homochirality of biomolecules

Keszthelyi

1995

Quart. Rev. Biophys.

119

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Molecules built up from a given set of atoms may differ in their three-dimensional structure. They may have one or more asymmetric centres that serve as reference points for the steric distribution of the atoms. Carbon atoms, common to all biomolecules, are often such centres. For example, the Cα atom between the carboxyl and amino groups in amino acids is an asymmetric centre: looking ON ward (i.e. from the carbOxyl to the amiNo group, with the Cα oriented so that it is above the carboxyl and amino groups) the radical characterizing the amino acid may be to the right (D-molecules) or to the left (L-molecules). Nineteen of the 20 amino acids occurring in proteins have such a structure (the exception is glycine, where the radical is a hydrogen atom). These pairs of molecules cannot be brought into coincidence with their own mirror image, as is the situation with our hands. The phenomenon has therefore been named handedness, or chirality, from the Greek word cheir, meaning hand. The two forms of the chiral molecules are called enantiomers or antipodes. They differ in rotating the plane of the polarized light either to the right or to the left. The sense of rotation depends on the wavelength of the measuring light, but at a given wavelength it is always opposite for a pair of enantiomers. Chirality may also occur when achiral molecules form chiral substances during crystallization (for example, quartz forms D-quartz or Lquartz). A detailed theoretical treatment of molecular chirality is given by Barron (1991).

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Spin-dependent electron scattering from optically active molecules

Cited by 59 publications

References 9 publications

Chiral electron transport: Scattering through helical potentials

Chiral electron transport: Scattering through helical potentials

Anomalously Large Chiral Sensitivity in the Dissociative Electron Attachment of 10-Iodocamphor

Origin of the homochirality of biomolecules

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