Classification of the lower energy levels of highly ionized transition elements

Abstract

230 newly classified spectral lines emitted from higly ionized elements and belonging to the sodium, magnesium, aluminium, silicon, phosphorus, sulphur and chlorine isoelectronic sequences are reported as a result of observations of laser-produced plasmas formed from elements in the period between chlorine and iron. The transitions studied occur between low-lying energy levels and are of importance both to the study of forbidden lines of astrophysical interest and to the identification of iron emission lines in solar spectra. The observation of the Fe XIII 3s23p2 3P-3s3p3 3S multiplet provides the most direct confirmation of the identity of the solar forbidden lines at 10 746.8 AA and 10 797.95 AA. Revised wavelengths of emission lines in the scandium spectrum between 320 AA and 800 AA are listed.