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Based on a recent unified formulation on dichorism and extinction of helicityon scattering by a small particle, dipolar in the wide sense, magnetodielectricor not, chiral or achiral, we show that such extinction is enhanced not only atresonances of the polarizabilities, but also due to interference between leftand right circularly polarized components of the incident wave, whichcontributes with appropriate parameters of the illuminating field, even if theparticle is achiral and is placed at points of the incident field at which thelocal incident helicity density is zero.  This phenomenon goes beyond standard circular dichroism (CD), and we analyzeit in detail on account of the values of the several quantities, both of theincident light and the particle, involved in the process. In addition, thisinterference produces a term in the helicity extinction that remarkably yieldsinformation on the real parts of the electric and/or magnetic polarizabilities,which are not provided by CD, of which that helicity extinction phenomenon maybe considered a generalization.

Non-zero helicity extinction in light scattered from achiral (or chiral) small particles located at points of null incident helicity density