Effects of Contamination on the Characteristic Loss Spectrum of Tungsten

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Abstract
Two types of contamination, the adsorption of a monolayer of atmospheric gas and the deposition of carbonaceous material under electron bombardment, were found to affect the characteristic electron energy-loss spectrum of tungsten. Spectra were obtained by analyzing with a 127° electrostatic spectrometer the energy distribution of 850-volt electrons scattered by the target through 90°. The deposition of the carbonaceous material was associated with the growth of the carbon Auger peak. Each type of contamination could be removed by heating the target in vacuum to a suitable temperature.