Abstract
The theory of the optical activity of the asymmetric top in pure rotational spectroscopy is extended to near-resonant frequencies, where there is no analog of the Rosenberg dispersion formula except at zero intensity. Since the optical activity effects due to pure rotational motion are expected to be quite weak, resonance enhancement (requiring the resonant form of the parameter β) may be crucial to their observation. The molecular parameters which determine optical activity are the same as in the off-resonance case. An expression for the parameter β, valid as the driving frequency goes through resonance, is displayed.
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