The photoelectric sensitivity of gas free surfaces of magnesium deposited on glass has been determined in the visible region of the spectrum. The long wave limit for all such surfaces deposited in vacuum is approximately 5100A. Air or oxygen in small amounts, or nitrogen activated by a glow discharge, sensitizes the surface to light of longer wave-lengths. Further oxidation of the surface causes the threshold to shift into the ultraviolet region of the spectrum.
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Cashman et al. (1933) studied this question.
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