Spectral Lines for Polarization Measurements of the Coronal Magnetic Field. III. Atomic Data for Si ix

Abstract

We report on large-scale ab initio multiconfiguration Dirac-Fock (MCDF) calculations for spectral lines of Si IX, with emphasis on the forbidden transitions 2p 2 3 P J→J′ . The J = 0 → J′ = 1 transition at 3.9346 μm holds promise as a diagnostic of coronal magnetic fields if and when future coronagraphic instruments can measure the polarized light at this wavelength.