The Transitions 4p-5s in Y VI, Zr VII, Nb VIII and Mo IX

Abstract
With the help of the spectra recorded in the Physics Department of Lund University, Y VI, Zr VII, Nb VIII and Mo IX are freshly analysed. The five 4s24p4 ground levels and the ten 4s24p35s levels of previous analyses are confirmed in the first three spectra, except for revising in Y VI the 4p4 1S0 and 4p35s(4S3/2)2 levels and interchanging 5s(2D3/2)1 with 5s(2D3/2)2. All level values are improved due to our new measurements. A new analysis of Mo IX establishing all the 4p4 and 4p35s levels is being reported.

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