Investigation of 4-d transition metals (Y, Zr, Nb, Mo) using the method of solid state plasma

The method of discrete energy losses of electrons scattered on the surfaces of flat samples of Y, Zr, Nb and Mo was applied to measure the energy of plasmon excitations. The electron energy losses were measured on polycrystalline high purity samples in vacuum of the order 10-7hPa. Measurements were made with a ''Riber'' quadrireticular analyser with an electric retarding field. The obtained spectra of characteristic energy losses allow one to expect the existence, in the group of transitions d-metals Y, Zr, Nb and Mo, of two components of volume plasmons corresponding to the excitation of s and d electrons. (author)