Parity violation in chiral molecules

The weak nuclear force does not treat left and right equally, so the two mirror-image forms of a chiral molecule should have very slightly different energies. This difference is predicted to be tiny and has never been measured.

Why it matters

A measurement would test electroweak theory in a new system, check relativistic quantum chemistry, and address whether a fundamental force contributes to the handedness of life's molecules.

Review

M. Quack, J. Stohner and M. Willeke, High-resolution spectroscopic studies and theory of parity violation in chiral molecules, Annual Review of Physical Chemistry, 2008. https://doi.org/10.1146/annurev.physchem.58.032806.104511 reference checked

Timestamp record

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Public log
Entry 16, in checkpoint 2,123
In the log by
Block 969,698, 2026-10-03

This text was in the PubPhys log by that date. The date says nothing about when the problem was first posed.

5 problems