Solar-flare emission lines in the range from 66 to 171 A; 2sr 2pk - 2s/r-1/ 2p/k+1/ transitions in highly ionized iron

New emission lines found in several flare spectra obtained with the Goddard grating spectrometer on the OSO-5 satellite, in 1969, have been listed by wavelength and relative intensity. These new lines, including several as strong as normal quiet-sun lines, are extremely variable in intensity and have been assigned mainly to transitions of the type 2sr 2pk - 2s(r-1) 2p(k+1) in iron ions up to Fe XXIII.