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The scattering polarization in the solar spectrum is traditionally modeledwith each spectral line treated separately, but this is generally inadequatefor multiplets where J-state interference plays a significant role. Throughsimultaneous observations of all the 3 lines of a Cr I triplet, combined withrealistic radiative transfer modeling of the data, we show that it is necessaryto include J-state interference consistently when modeling lines with partiallyinteracting fine structure components. Polarized line formation theory thatincludes J-state interference effects together with partial frequencyredistribution for a two-term atom is used to model the observations.Collisional frequency redistribution is also accounted for. We show that theresonance polarization in the Cr I triplet is strongly affected by the partialfrequency redistribution effects in the line core and near wing peaks. The Cr Itriplet is quite sensitive to the temperature structure of the photosphericlayers. Our complete frequency redistribution calculations in semi-empiricalmodels of the solar atmosphere cannot reproduce the observed near wingpolarization or the cross-over of the Stokes Q/I line polarization about thecontinuum polarization level that is due to the J-state interference. Whenhowever partial frequency redistribution is included, a good fit to thesefeatures can be achieved. Further, to obtain a good fit to the far wings, asmall temperature enhancement of the FALF model in the photospheric layers isnecessary.

J-state interference signatures in the Second Solar Spectrum: Modeling the Cr I triplet at 5204-5208 A