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This randomized trial examines work function changes in sodium films, revealing implications for surface contamination effects.
Clean vacuum-deposited films of sodium were found to exhibit a work function of approximately 2.75 eV. Modification of the surface-plasmon frequency due to sulfur surface contamination was observed. The new value of the work function was shown to be due to a lack of surface contamination.
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Whitefield et al. (1971) studied this question.
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