Parity non-conservation and NMR parameters

Barra, Anne‐Laure; Robert, J. B.

doi:10.1080/00268979609484479

Cited by 62 publications

(42 citation statements)

References 29 publications

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“…Based on calculations in Ref. [45], measurement of a non-zero antisymmetric J-coupling could permit the observation of a first-order energy shift arising from parity non-conservation in the molecular Hamiltonian.…”

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confidence: 99%

Measurement of untruncated nuclear spin interactions via zero- to ultralow-field nuclear magnetic resonance

et al. 2015

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Zero-to ultra-low-field nuclear magnetic resonance (ZULF NMR) provides a new regime for the measurement of nuclear spin-spin interactions free from effects of large magnetic fields, such as truncation of terms that do not commute with the Zeeman Hamiltonian. One such interaction, the magnetic dipole-dipole coupling, is a valuable source of spatial information in NMR, though many terms are unobservable in high-field NMR, and the coupling averages to zero under isotropic molecular tumbling. Under partial alignment, this information is retained in the form of so-called residual dipolar couplings. We report zero-to ultra-low-field NMR measurements of residual dipolar couplings in acetonitrile-2-13 C aligned in stretched polyvinyl acetate gels. This represents the first investigation of dipolar couplings as a perturbation on the indirect spin-spin J-coupling in the absence of an applied magnetic field. As a consequence of working at zero magnetic field, we observe terms of the dipole-dipole coupling Hamiltonian that are invisible in conventional high-field NMR. This technique expands the capabilities of zero-to ultra-low-field NMR and has potential applications in precision measurement of subtle physical interactions, chemical analysis, and characterization of local mesoscale structure in materials.

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confidence: 99%

Measurement of untruncated nuclear spin interactions via zero- to ultralow-field nuclear magnetic resonance

et al. 2015

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“…[36] NMR spectroscopy [37,38] was also proposed as a method of observing parity-violating effects and recently, a parity-violation effect may have been observed by using Mˆssbauer spectroscopy on a chiral iron complex, [39] although the result seems in contradiction with the theoretical evaluations. We also mention the original proposal of directly measuring the parity-violation energy difference of a chiral molecule in its ground state.…”

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Search for Resolution of Chiral Fluorohalogenomethanes and Parity‐Violation Effects at the Molecular Level

et al. 2003

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The first observation of a parity-violation effect in molecules induced by weak interactions is still a dream that requires the synthesis and, eventually, the resolution of the enantiomers of well-chosen simple chiral molecules together with an appropriate experimental set-up for high-resolution spectroscopy. Performing IR spectroscopy on highly enantiomerically enriched samples of bromochlorofluoromethane succeeded in giving an upper limit of 10(-13) for the relative vibrational energy difference between the two enantiomers. These results led us to conceive a new experimental set-up based on a supersonic molecular beam and to work on other chiral molecules, such as chlorofluoroiodomethane. A synthesis of (+/-)-CHCIFI from racemic chlorofluoroiodoacetic acid should, in the near future permit the preparation of optically active samples of this haloform. The development of molecular beam spectroscopy using a two-photon Ramsey-fringes experiment should allow us to reach the precision needed to observe parity violation. These experimental challenges, which stimulate a close collaboration between chemists and physicists, are presented. The success of these projects would open the route to new information on the molecular Hamiltonian, a better knowledge of the electroweak interaction, and a better control of the various chirality-related properties of simple molecules.

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“…In 1986, Barra, Robert, and Wiesenfeld discussed the possibility of measuring PV in NMR observables such as the nuclear magnetic shielding, the nuclear spin-spin coupling, and the spin-rotation coupling [107][108][109][110][111]. From relativistic extended H€ uckel calculations, they estimated that PV shifts in the nuclear magnetic shielding are in the mHz range for chiral molecules containing heavy elements [107,108]. Ultrahigh-resolution highfield NMR is indeed capable to achieve mHz resolution.…”

Section: Nmr Spectroscopymentioning

confidence: 99%

The Search for Parity Violation in Chiral Molecules

Schwerdtfeger

2010

Computational Spectroscopy

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Parity non-conservation and NMR parameters

Cited by 62 publications

References 29 publications

Measurement of untruncated nuclear spin interactions via zero- to ultralow-field nuclear magnetic resonance

Measurement of untruncated nuclear spin interactions via zero- to ultralow-field nuclear magnetic resonance

Search for Resolution of Chiral Fluorohalogenomethanes and Parity‐Violation Effects at the Molecular Level

The Search for Parity Violation in Chiral Molecules

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