The classification of Ni XI to XVII and Co X to XVII emission lines from 3s23pn-3s 3pn+1and 3pn-3pn-13d transitions and the identification of nickel solar lines

The 3s 2 3p n -3s 3p n+1 and 3p n -3p n-1 3d transitions in Ni XI to XVII and Co X to XVII are classified as a result of the analysis of the spectra emitted from a theta-pinch plasma containing small percentages of nickel or cobalt carbonyl. The nickel lines account for a number of lines in the solar spectrum between 140 AA and 300 AA. The observations check the identity of six coronal forbidden lines.