Enantiomeric excess determination based on nonreciprocal transition induced spectral line elimination

TL;DR

This paper explores how nonreciprocal transitions in multi-level atoms or molecules can eliminate specific spectral lines in spontaneous emission spectra, offering a novel method to determine enantiomeric excess in chiral molecules without pure samples.

Contribution

It introduces a new spectral line elimination technique based on nonreciprocal transitions for enantiomeric excess determination in chiral molecules.

Findings

Nonreciprocal transitions can eliminate spectral lines in spontaneous emission.

The method allows enantiomeric excess measurement without enantio-pure samples.

Phase-related driving fields induce nonreciprocal transitions in chiral molecules.

Abstract

The spontaneous emission spectrum of a multi-level atom or molecule with nonreciprocal transition is investigated. It is shown that the nonreciprocal transition can lead to the elimination of a spectral line in the spontaneous emission spectrum. As an application, we show that nonreciprocal transition arises from the phase-related driving fields in chiral molecules with cyclic three-level transitions, and the elimination of a spectral line induced by nonreciprocal transition provides us a method to determine the enantiomeric excess for the chiral molecules without requiring the enantio-pure samples.