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Tytuł:
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Search for resolution of chiral fluorohalogenomethanes and parity-violation effects at the molecular level.
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Autorzy:
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Crassous J; Laboratoire de Chimie UMR CNRS 5532-Ecole Normale Supérieure de Lyon 46, allée d'Italie, 69364 Lyon, France. />Monier F
Dutasta JP
Ziskind M
Daussy C
Grain C
Chardonnet C
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Źródło:
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Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2003 Jun 16; Vol. 4 (6), pp. 541-8.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Weinheim, Germany : Wiley-VCH Verlag, c2000-
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Entry Date(s):
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Date Created: 20030703 Date Completed: 20030929 Latest Revision: 20030702
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Update Code:
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20240104
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DOI:
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10.1002/cphc.200200536
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PMID:
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12836475
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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.