The Energy Distribution of Secondary Electrons from Columbium

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Abstract
Energy distribution curves of secondary electrons from an outgassed columbium target have been obtained with the same apparatus as in similar studies on molybdenum. The results from Cb are qualitatively similar to those from Mo. "Discrete loss" and "fixed energy" groups of secondary electrons are observed at energies which are in most cases slightly less than the corresponding ones in the case of Mo. The number of elastically reflected electrons was also studied as a function of primary energy. The curve shows marked similarity to that obtained from Mo, the peaks again being at somewhat lower energies in the case of Cb. It is shown that the lower values of the energies involved in the various phenomena in the present case are to be expected because of the lower atomic number of Cb and because of its larger lattice constant.

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