Radiative transfer with J-state interference in a two-term atom. Partial frequency redistribution in the non-magnetic case

Details Radiative transfer with J-state interference in a two-term atom. Partial frequency redistribution in the non-magnetic case Radiative transfer with J-state interference in a two-term atom. Partial frequency redistribution in the non-magnetic case

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...535a..35s&link_type=abstract

Astronomy & Astrophysics, Volume 535, id.A35

Astronomy and Astrophysics

Astrophysics

Line: Formation, Methods: Numerical, Polarization, Radiative Transfer, Scattering, Sun: Atmosphere

Scientific paper

Context. Quantum interference phenomena play a fundamental role in the formation of linear polarization that arises from scattering processes in multiplets of the solar spectrum. In particular, the J-state interference between different line components of a multiplet (arising from transitions in a two-term atom) produces significant effects in the linearly polarized spectra. Aims: We aim to solve the polarized radiative transfer equation for a two-term atom with the unpolarized lower term in isothermal slabs, including the effect of the interference between the upper J-states and partial frequency redistribution (PRD). We consider only the case of non-magnetic scattering. Methods: The PRD matrix for the J-state interference derived in previous works is incorporated into the polarized transfer equation. The standard form of the two-level atom transfer equation is extended to a two-term atom. The transfer problem is then solved using a traditional polarized approximate lambda iteration method. Results: We show how the PRD and the J-state interference together affect the shapes of the (I,Q/I) profiles. We present the benchmark solutions for isothermal, constant-property slabs of a given optical thickness. We consider a hypothetical doublet produced by an L = 0 → 1 → 0 scattering transition with spin S = 1/2. We present the results in the form of Stokes (I,Q/I) profiles for different values of (i) the line separation, (ii) optical thickness, (iii) thermalization parameter, and (iv) the continuum opacity.

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