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Calculation of the parity nonconserving energy difference between mirror‐image molecules
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In this paper, the theory of energy shifts in mirror image molecules arising from parity nonconserving weak neutral currents is developed, and its connection with the theories of optical activity is discussed.Abstract:
The theory of energy shifts in mirror‐image molecules arising from parity nonconserving weak neutral currents is developed. Its connection with the theory of optical activity is discussed. In order to demonstrate the existence of the energy shift, which produces an energy difference between an optically active molecule and its mirror image, an exact calculation is performed for a simple one‐electron model (the Condon model). Then approximate LCAO‐MO calculations are performed on two specific molecules, twisted ethylene and A‐nor‐2‐thiacholestane, in order to obtain more reliable order‐of‐magnitude estimates of the energy shifts than available previously. According to our calculations, the former molecule has an energy shift two orders of magnitude larger than the latter, but both molecules have energy shifts which are appreciably smaller than the previous estimates.read more
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Book
Molecular Light Scattering and Optical Activity
TL;DR: Using classical and quantum methods with a strong emphasis on symmetry principles, the volume as discussed by the authors develops the theory of varied optical activity and related phenomena from the perspective of molecular scattering of polarized light.
Journal ArticleDOI
The origin and amplification of biomolecular chirality
TL;DR: The Vester-Ulbricht (V-U) ttypothesis, a model for Asymmetric Synthesis of Circularly Polarized Eight, shows clear patterns in how chiral homogeneity and chiral randomness are modelled on each other.
Journal ArticleDOI
How Important is Parity Violation for Molecular and Biomolecular Chirality
TL;DR: The current status of theory and some of the current experimental approaches are discussed, and some tentative answers to questions about small energy differences predicted by recently introduced methods of electroweak quantum chemistry are given.
Journal ArticleDOI
Origins of biomolecular handedness
TL;DR: This work has shown that the parity-violating weak neutral current interaction gives rise to an energy difference between a chiral molecule and its mirror-image isomer, resulting in a small stabilization of the L-amino acids and theL-peptides in the α-helix and the β-sheet conformation relative to the corresponding enantiomer.
Journal ArticleDOI
Weak neutral currents and the origin of biomolecular chirality
Dilip K. Kondepudi,G. W. Nelson +1 more
TL;DR: In this paper, it was shown that a minute but systematic chiral interaction, no stronger than the WNC interaction in amino acids, can, over a period of ∼15,000 yr, determine which enantiomer will dominate.
References
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Partial Symmetries of Weak Interactions
TL;DR: In this paper, the weak and electromagnetic interactions of leptons are examined under the hypothesis that the weak interactions are mediated by vector bosons, and it is shown that the simplest partially-symmetric model reproducing the observed electromagnetic and weak interactions requires the existence of at least four vector-boson fields (including the photon).
Journal ArticleDOI
The Spectra and Electronic Structure of the Tetrahedral Ions MnO4−, CrO4−−, and ClO4−
Max Wolfsberg,Lindsay Helmholz +1 more
TL;DR: In this paper, a semi-empirical approach was used to calculate the energy of the ground state and the first few excited states of permanganate, chromate, and perchlorate ions.
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