Scattering Of Chiral Electrons By Chiral Molecules

Johnston, Mark; Trantham, Kenneth; Gallup, Gordon A

doi:10.1007/978-1-4613-0421-0_15

Cited by 6 publications

(11 citation statements)

References 2 publications

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“…, where Z is the highest nuclear charge in the target [8]. This is observed roughly in the Münster data.…”

supporting

confidence: 70%

“…One could reasonably expect that would be enhanced in the regions where temporary negative ions are formed, because resonant states might give the target and projectile an enhanced probability of 'sampling each other's chirality' [7,8]. Indeed, the Münster data exhibit a resonance-like structure which is reminiscent of the resonance structure in the total cross sections in the cases where these latter data were obtained.…”

Section: Introductionmentioning

confidence: 94%

“…At resonance energies, the transmission asymmetry A may be enhanced due to the lengthened time the incident electron spends near the chiral centre of the molecule [7,8]. In molecules, resonances often occur when an electron becomes transiently bound in a normally unoccupied molecular orbital, thus forming a temporary negative ion (TNI).…”

Section: Electron Transmission Spectramentioning

confidence: 99%

“…Because symmetry permits non-zero values of A, the central question becomes what dynamical scattering mechanisms actually cause it to be non-zero. Three qualitatively distinct mechanisms have been proposed [8].…”

mentioning

confidence: 99%

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An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism

Scheer¹,

Gallup²,

Gay³

2006

J. Phys. B: At. Mol. Opt. Phys.

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We investigate the causes of electron-circular dichroism (ECD) in bromocamphor and dibromocamphor, focusing specifically on the electron helicity density of the target. Using electron transmission spectroscopy (ETS) and quantum chemical calculations, we have observed and assigned temporary negative ion states of bromocamphor and dibromocamphor. Further calculations were conducted to determine the helicity densities of these compounds. Large helicity densities are found in the regions of large wavefunction amplitude of the normally unoccupied molecular orbitals responsible for resonances in the scattering cross sections. We relate our ETS assignments and helicity density results to the chiral asymmetry data observed in electron-circular dichroism experiments by the Münster group (Nolting et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 5491). Our results support helicity density as a possible source of chiral asymmetry at certain resonance positions in bromocamphor and dibromocamphor.

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“…, where Z is the highest nuclear charge in the target [8]. This is observed roughly in the Münster data.…”

supporting

confidence: 70%

Section: Introductionmentioning

confidence: 94%

Section: Electron Transmission Spectramentioning

confidence: 99%

mentioning

confidence: 99%

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An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism

Scheer¹,

Gallup²,

Gay³

2006

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…Active feedback to correct this problem has been investigated by several groups [3][4][5][6][7][8], but to our knowledge this is the first scheme that does not make use of electro-optic or electromechanical feedback operating at the helicity-reversal frequency to force instrumental asymmetries to zero. The work reported here was necessitated by the requirements of a larger experiment designed to observe electron circular dichroism (ECD) [9,10]. In this experiment, polarized electrons with alternately forward and backward longitudinal spins traverse a chiral vapor target.…”

Section: Introductionmentioning

confidence: 99%