Extended analysis of the spectrum of triply-ionized ytterbium (Yb IV) and transition probabilities

J.F. Wyart, W.U.L. Tchang-Brillet, N. Spector, P. Palmeri, P. Quinet and E. Biémont,

Phys. Scr. (in press, 2000)

The spectrum of Yb IV has been remeasured and its analysis has been extended. It is supported by the comparison of line intensities with transition probabilities derived from the Cowan (1981) codes. Starting from the first analysis by Sugar, Kaufman and Spector (1978), the number of established levels has been increased from 111 to 193, including high excitation levels of the new 4f¹²7s+4f¹²6d even configurations. Of the 1023 classified lines about one half are new. Computed transition probabilities are given for selected lines.

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