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Abstract
The soft x-ray M-emission spectrum of Nb has been measured. The Mrv,vYII peak has been found to be the Mrv, v emission band and the Mrv,vYI peak is a satellite of the Mrv,vNII, III emission line. The emission spectrum indicates that Nb is similar to vanadium in that the 4d electrons are not localized and are in the conduction band. In addition, the soft x-ray spectrum indicates that some of the electtrons in the band have p character.