THE SPECTRA OF DOUBLY AND TRIPLY IONIZED YTTERBIUM.
Spectroscopic rept. no. 21,
JOHNS HOPKINS UNIV BALTIMORE MD
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The emission spectrum of ytterbium was photographed under varied conditions from 600 A to 11,000 A in order to obtain a complete description of the spectra of the doubly and triply ionized species. The main transition arrays of these species were identified, and where feasible, the analysis carried through. All 41 energy levels, 28 odd and 13 even, belonging to the 4f14, 4f135d, 4f136s, 4f136p and 4f137s configurations of YbIII were experimentally determined along with the appropriate quantum numbers. Eleven of 20 possible 4f136d levels and their quantum numbers were also determined. One hundred ninety three lines were classified in the YbIII energy level scheme with an average deviation of 0. 05cm. All the YbIII levels are supported by intermediate coupling calculations. The two 4f13 levels of YbIV were determined in addition to 20 of a possible 107 4f125d levels, of which a few are expected to be fortuitous. Author