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--- public:overview [2025/09/09 22:05]
57.141.0.44 old revision restored (2025/08/07 17:16)
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 The present project addresses a more fundamental aspect of chirality, namely it aims at providing the first experimental observation of the energy difference between enantiomers of chiral molecules due to parity violation (PV). A successful experiment will have a significant impact on our understanding of the stability and dynamics of chiral molecules as well as the origin of biochirality. Such a project is inherently multidisciplinary and is expected to lead to important advances in spectroscopy, chemical synthesis and quantum chemical methods.
-A number of experimental techniques have been proposed for the observation of parity non-conservation (PNC) in molecular systems, including vibrational-rotational, electronic , Mössbauer and NMR spectroscopy, as well as crystallization  and solubility experiments, but no unambiguous observation has so far been made. Theory plays a very important role in this field since it can provide predictions of PNC effects and thus guide research. In 1974 Bouchiat and Bouchiat predicted that PNC effects should scale as Z^{3}  with respect to nuclear charge Z  in atomic systems and suggested to search for such effects in highly forbidden transitions of atomic spectra. Such effects were indeed observed soon thereafter. In molecular systems the situation is even more favorable with a Z^{5}  scaling law, although additional complications are introduced by the nuclear degrees of freedom. There has therefore been a quite significant activity in the quantum chemical community in the past years with important contributions from the groups of M. Quack, R. Berger, P. Lazzeretti, P. Schwerdtfeger, P. Manninen and T. Saue that have been summarized in recent reviews.
+A number of experimental techniques have been proposed for the observation of parity non-conservation (PNC) in molecular systems, including vibrational-rotational, electronic , Mössbauer and NMR spectroscopy, as well as crystallization  and solubility experiments, but no unambiguous observation has so far been made. Theory plays a very important role in this field since it can provide predictions of PNC effects and thus guide research. In 1974 Bouchiat and Bouchiat predicted that PNC effects should scale as Z^{3}  with respect to nuclear charge Z  in atomic systems and suggested to search for such effects in highly forbidden transitions of atomic spectra. Such effects were indeed observed soon thereafter [Sapirstein:Parity-violation]. In molecular systems the situation is even more favorable with a Z^{5}  scaling law, although additional complications are introduced by the nuclear degrees of freedom. There has therefore been a quite significant activity in the quantum chemical community in the past years with important contributions from the groups of M. Quack, R. Berger, P. Lazzeretti, P. Schwerdtfeger, P. Manninen and T. Saue that have been summarized in recent reviews.

ncpchem

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