CIX. The photoelectric properties of films of beryllium, aluminium, magnesium, and thallium

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Abstract
Opaque films formed by the evaporation of the above metals in high vacuum on to a previously degassed surface were examined with respect to their photoelectric properties in monochromatic light. Measurements were made between λ 5000 and 2400 Å., and the photoelectric response in coulombs per erg as well as in electrons per quantum was plotted against the wave-length. Magnesium was found to be a suitable surface to use in the construction of photoelectric cells for measurement in the ultra-violet.