The generation and transformation of polarization signals in molecular lines through collective anisotropic resonant scattering

We discuss the existence of elliptical polarisation in rotational spectral lines CO and other molecules within context Anisotropic Resonant Scattering (ARS) model. show that effect ARS on radiation field can lead to not only previously predicted transformation background linear into circular (i.e., Faraday conversion), but also occurrence rotation generation elliptically polarised signals an otherwise initially unpolarised field. This is due a collective behaviour between large number acting as diffraction ensemble strongly favours forward scattering over any mode. Our application astronomical data demonstrates dependency Stokes parameters strength orientation ambient magnetic field, suggests will manifest itself for wide range molecular species transitions.