ANALYSIS OF THE 3D(6)4S(6D)4F-5G SUPERMULTIPLET OF FE-I IN LABORATORYAND SOLAR INFRARED-SPECTRA

The combined laboratory and solar analysis of the highly excited subco nfigurations 3d(6)4s(6D)4f and 3d(6)4s(6D)5g of Fe I has allowed us to classify 87 lines of the 4f-5g supermultiplet in the spectral region 2545-2585 cm-1. The level structure of these JK-coupled configurations is predicted by semiempirical calculations and the quadrupolic approx imation. Semiempirical gf-values have been calculated and are compared to gf-values derived from the solar spectrum. The solar analysis has shown that these lines, which should be much less sensitive than lower excitation lines to departures from LTE and to temperature uncertaint ies, lead to a solar abundance of iron which is consistent with the me teoritic value (A(Fe) = 7.51).