Parity Violation in Molecular Systems
Summary
Parity violation in molecular systems arises from the subtle breaking of spatial inversion symmetry by the weak force, one of the four fundamental interactions. In chiral molecules—those that exist in non-superimposable mirror-image forms—this effect induces minute energy and frequency differences between enantiomers. Although these differences are typically in the range of 10−15 to 10−12 of the total molecular energy, advances in high-resolution spectroscopy and quantum-chemical theory have made it possible to predict and approach their experimental detection. Beyond its intrinsic importance for testing the Standard Model of particle physics, molecular parity violation has implications for understanding the origin of biological homochirality and offers a pathway to probe new physics through precision measurements of vibrational, rotational and spin-dependent observables.
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Parity Violation in Molecular Systems publication trend
The graph below shows the total number of articles in parity violation in molecular systems across all publications each year (not limited to Nature Index journals).
Technical terms
Parity violation: The nonconservation of spatial inversion symmetry, especially by the weak nuclear force, leading to differences between mirror-image configurations.
Enantiomer: One of two stereoisomers of a chiral molecule that are non-superimposable mirror images of each other.
Anapole moment: A toroidal distribution of current inside a nucleus that produces a parity-violating electromagnetic interaction.
Ramsey spectroscopy: A time-domain technique using separated oscillatory fields to measure transition frequencies with very high precision.
Spin–spin coupling: An interaction between nuclear spins that can include parity-nonconserving contributions in certain molecular systems.
References
- Simultaneous Enantiomer-Resolved Ramsey Spectroscopy Scheme for Chiral Molecules. Physical Review X (2023).
- Using parity-nonconserving spin-spin coupling to measure the Tl nuclear anapole moment in a TlF molecular beam. Physical Review Research (2023).
- Toward Detection of the Molecular Parity Violation in Chiral Ru(acac)3 and Os(acac)3. The Journal of Physical Chemistry Letters (2022).
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