Molecular parity violation in electronically excited states

Berger, Robert

doi:10.1039/b209457f

Cited by 40 publications

(26 citation statements)

References 49 publications

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“…A number of experimental techniques have been proposed for the observation of PV in molecular systems, including rovibrational 11 , electronic [12][13][14] , Mössbauer 15 and NMR 16 spectroscopy, as well as crystallization 17 and solubility 18 experiments, or optical activity measurements 19 , but no unambiguous observation has so far been made. After the pioneering work of Yamagata 1 , Rein 2 , and Gajzago and Marx 3 who first suggested that weak interaction is responsible for an energy difference in the spectrum of right-and left-handed chiral molecules, Letokhov proposed in 1975 to observe PV effects in molecules as a difference 11 After a first test on separated enantiomers of camphor in 1977 20 , the most sensitive experiments to date following Lethokov's proposal were performed around 2000 by authors of this paper.…”

Section: Introduction: Context and Historymentioning

confidence: 99%

High resolution spectroscopy of methyltrioxorhenium: towards the observation of parity violation in chiral molecules

Stoeffler

Darquié

Shelkovnikov

et al. 2011

Phys. Chem. Chem. Phys.

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Originating from the weak interaction, parity violation in chiral molecules has been considered as a possible origin of the biohomochirality. It was predicted in 1974 but has never been observed so far. Parity violation should lead to a very tiny frequency difference in the rovibrational spectra of the enantiomers of a chiral molecule. We have proposed to observe this predicted frequency difference using the two photon Ramsey fringes technique on a supersonic beam. Promising candidates for this experiment are chiral oxorhenium complexes, which present a large effect, can be synthesized in large quantity and enantiopure form, and can be seeded in a molecular beam. As a first step towards our objective, a detailed spectroscopic study of methyltrioxorhenium (MTO) has been undertaken. It is an ideal test molecule as the achiral parent molecule of chiral candidates for the parity violation experiment. For the 187 Re MTO isotopologue, a combined analysis of Fourier transform microwave and infrared spectra as well as ultra-high resolution CO 2 laser absorption spectra enabled the assignment of 28 rotational lines and 71 rovibrational lines, some of them with a resolved hyperfine structure. A set of spectroscopic parameters in the ground and first excited state, including hyperfine structure constants, was obtained for the ν as antisymmetric Re=O stretching mode of this molecule. This result validates the experimental approach to be followed once a chiral derivative of MTO will be synthesized, and shows the benefit of the combination of several spectroscopic techniques in different spectral regions, with different set-ups and resolutions. First high resolution spectra of jet-cooled MTO, obtained on the setup being developed for the observation of molecular parity violation, are shown, which constitutes a major step towards the targeted objective. † Supplementary information available in the ancillary file: Measured and fitted transition frequencies as well as spectroscopic constants.1

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Section: Introduction: Context and Historymentioning

confidence: 99%

High resolution spectroscopy of methyltrioxorhenium: towards the observation of parity violation in chiral molecules

Stoeffler

Darquié

Shelkovnikov

et al. 2011

Phys. Chem. Chem. Phys.

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“…Parity violation is supposed to have implications in biomolecular homochirality (see refs. [77,78] and references therein).…”

Section: Broken Symmetrymentioning

confidence: 97%

Understanding High‐Resolution Spectra of Nonrigid Molecules Using Group Theory

Schnell

2010

ChemPhysChem

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Permutation-inversion group theory has developed to become an important tool in the high-resolution spectroscopy of nonrigid molecules. This large class of molecules is very intriguing to study. Small molecules such as ammonia or Na(3) are known to be nonrigid. With increasing size, however, several large-amplitude motions are possible in a molecule, and can even interact with each other. The high-resolution spectra of nonrigid molecules are known to be quite complicated and very rich in information. Details about the molecule and its internal dynamics can be extracted, such as the molecular structure, the character of the chemical bonds, and the barrier heights to internal rotation and their dependence on the chemical bonds. However, due to the nonrigidity of the molecule and the complexity of such spectra, their analysis is usually quite challenging. Theoretical methods are needed for their prediction and analysis. This Review concentrates on permutation-inversion group theory and its usefulness for the analysis of high-resolution spectra of nonrigid molecules, which is examined in more detail using different examples. In a separate section, a special aspect of molecular symmetry is discussed: the breakdown of symmetry principles. Special emphasis is placed on the breakdown of space inversion symmetry (parity violation) in chiral molecules and its possible implications in high-resolution spectroscopy.

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“…This allows one to isolate the PV energy shift in the ground state as a spectroscopic combination difference. A similar scheme has been introduced by Berger, but suggesting an achiral electronic ground state and a chiral excited state, which, for example, is the case for the molecule HFCO [124].…”

Section: Electronic Spectroscopymentioning

confidence: 99%

The Search for Parity Violation in Chiral Molecules

Schwerdtfeger

2010

Computational Spectroscopy

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Molecular parity violation in electronically excited states

Cited by 40 publications

References 49 publications

High resolution spectroscopy of methyltrioxorhenium: towards the observation of parity violation in chiral molecules

High resolution spectroscopy of methyltrioxorhenium: towards the observation of parity violation in chiral molecules

Understanding High‐Resolution Spectra of Nonrigid Molecules Using Group Theory

The Search for Parity Violation in Chiral Molecules

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