4p^2 Configuration in Neutral Zinc (Zn i)

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Abstract
The Zn i 4s4p 3P°–4p2 3P multiplet (2070–2105 Å) was remeasured on spectrograms from 10.7-m grating spectrographs. The new wavelengths are used to determine improved values for the 4p2 3P levels. Predicted positions and percentage compositions for the unknown 4p2 1D2 and 1S0 levels are calculated in a pure-configuration approximation. These results are combined with our measurement of the autoionization width for the 3P2 level, to obtain a predicted autoionization probability of 1.3×1015 s−1 for the 1D2 level. The autoionization probability for the 1S0 level is similarly estimated to be 13s−1. Wavelengths are given for five new Zn i transitions (2040–2053 Å) from unknown autoionizing levels, probably belonging to the 4p4d configuration.
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