Temperature Classification of Europium Lines.

Abstract

view Abstract Citations (7) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Temperature Classification of Europium Lines. King, Arthur S. Abstract The paper gives wave-length measures and temperature classifications for 3950 europium lines from X 2100 to X 10165. Of these, slightly less than 2200 belong to neu- tral europium. A very large intensity range is found for both neutral and singly ionized lines. Many of the former are relatively stronger in the furnace than in the arc. The absorption furnace spectrum was used to obtain low-level lines in the ultraviolet to X 2659. Lines of Eu ii, selected by comparison of arc and spark spectra, range from low- level furnace lines to those much enhanced in the spark. An ultraviolet spark spectrum, which is absent from the arc, probably belongs to Eu m. In addition to arc and furnace intensities, the degree of widening, due to hyperfine structure, of a large proportion of the lines is indicated in Table 2. Close agreement of lines in the sunspot spectrum with the ultimate lines of Eu i indicates the presence of neutral europium in the solar atmosphere. Additional identi- fications of Eu II lines in the sun have been made. Approximately three-fourths of the lines ascribed by Eder to a suggested unknown substance "eurosamariuna" have been identified as belonging to known rare earths, nearly haff being lines of europium. Seventeen bands of EuC13 appearing in the furnace spectrum from X 5695 to X 745o have their limiting wave lengths given and their distinctive features described Publication: The Astrophysical Journal Pub Date: April 1939 DOI: 10.1086/144061 Bibcode: 1939ApJ....89..377K full text sources ADS | Related Materials (1) Reprint: 1939CMWCI.608....1K