Narrow resonances of saturated absorption of the asymmetrical molecule CHFCiBr and the possibility of weak current detection in molecular physics

Kompanets, O. N.; Kukudzhanov, A R; Letokhov, V. S.; Gervits, L. L.

doi:10.1016/0030-4018(76)90111-5

Cited by 101 publications

(78 citation statements)

References 5 publications

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“…26 Similar and even better limits had been previously achieved at room temperature with CHBrClF and camphor using Doppler free infrared and saturation spectroscopy. 28,29 Thus, at first glance the progress achieved up to 1997 may seem small.…”

Section: Chbrclf: Chemistry High Resolution Spectroscopy and Paritymentioning

confidence: 95%

“…26 The infrared spectroscopy of CHBrClF has been of interest in relation to parity violation since the early unsuccessful IR-spectroscopic attempts by the group of Letokhov. 10,27,28 Experimental and theoretical efforts on this molecule in our own group started about a decade ago. A first breakthrough was achieved with high-resolution molecular beam (supersonic jet) infrared diode laser and Fourier Transform Infrared Spectroscopy (FTIR), 30 which in an essential collaboration of the ETH Zürich microwave and infrared groups led to the first full high-resolution rotational analysis of the 1 CF-stretching fundamental.…”

Section: Chbrclf: Chemistry High Resolution Spectroscopy and Paritymentioning

confidence: 99%

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Molecular chirality and the fundamental symmetries of physics: Influence of parity violation on rovibrational frequencies and thermodynamic properties

Qüack

Stohner

2001

Chirality

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We introduce the topic of fundamental symmetries of physics in relation to molecular chirality by a brief review of the development and current status of the theory of parity violation in chiral molecules. We then discuss in some detail CHBrClF (bromochlorofluoromethane) as a test case, to which the work of André Collet has contributed importantly. For this molecule and its isotopomers, we report here the first detailed theoretical calculations of the influence of parity violation on statistical thermodynamic properties. High-quality ab initio calculations (RPA, random phase approximation, and CASSCF, complete-active-space self-consistent-field) were performed to determine the small energy difference between R- and S-enantiomers of H and D isotopomers of bromochlorofluoromethane (CHBrClF, CDBrClF), and fluorooxirane ((1)H(3)C(2)OF) introduced by the parity-violating weak interaction. Together with vibrational and rotational frequency shifts caused by parity violation, these were used to determine the statistical thermodynamic quantities from the corresponding partition functions within the separable harmonic and in part also anharmonic adiabatic approximation. Temperature-dependent equilibrium constants for the stereomutation were calculated and are discussed in relation to biochemical homochirality.

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Section: Chbrclf: Chemistry High Resolution Spectroscopy and Paritymentioning

confidence: 95%

Section: Chbrclf: Chemistry High Resolution Spectroscopy and Paritymentioning

confidence: 99%

Molecular chirality and the fundamental symmetries of physics: Influence of parity violation on rovibrational frequencies and thermodynamic properties

Qüack

Stohner

2001

Chirality

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“…Several unsuccessful attempts have been made, including the use of Mçssbauer [99] and IR spectroscopy. [90,[100][101][102] In ref. [102], the transition frequencies of the two enantiomers of CHFClBr at around 9.3 mm are found to be equal to within 13 Hz.…”

Section: Broken Symmetrymentioning

confidence: 98%

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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“…In 1976, V. Letokhov and co-workers suggested that CHBrClF could be an ideal molecule for the observation of a tiny PV effect induced by the weak interaction by looking for a frequency difference in the spectrum of the left-and right-handed species. [6] Although the effect is expected to be very small, it was suggested that this energy difference between right-and left-handed enantiomers could be at the origin of the symmetry breaking which occurs in living systems. The DNA molecule, with its right-handed double helix, and L-amino acids, in most naturally-occuring peptides, are the most famous examples of such symmetry breaking.…”

Section: Introductionmentioning

confidence: 98%

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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Narrow resonances of saturated absorption of the asymmetrical molecule CHFCiBr and the possibility of weak current detection in molecular physics

Cited by 101 publications

References 5 publications

Molecular chirality and the fundamental symmetries of physics: Influence of parity violation on rovibrational frequencies and thermodynamic properties

Molecular chirality and the fundamental symmetries of physics: Influence of parity violation on rovibrational frequencies and thermodynamic properties

Understanding High‐Resolution Spectra of Nonrigid Molecules Using Group Theory

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

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