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- W2085750173 abstract "The intensity variations with voltage of some of the brighter lines of the low voltage helium arc spectrum were determined by means of a recently developed photoelectric spectrophotometer. The radiation was developed in a copper ball, 20 cm in diameter. The equipotential cathode and grid from a commercial three-electrode tube formed the internal structure, the sphere itself being the anode. This arrangment gave an extremely bright spectrum, even at the striking voltage, with a relatively low current density in the space. The results on $5016 (1^{1}Sensuremath{-}2^{1}P)$ and on $6678 (1^{1}Pensuremath{-}2^{1}D)$ were generally smooth curves. Lines $4026 (1^{3}Pensuremath{-}4^{3}D)$, $4471 (1^{3}Pensuremath{-}3^{3}D)$, and $5876 (1^{3}Pensuremath{-}2^{3}D)$, show a region of constant intensity with arc voltages from 27 to 35 volts, thereafter increasing smoothly. Line $4713 (1^{3}Pensuremath{-}3^{3}S)$ shows definite maxima near the critical exciting potentials. The accurate linear relationship between the intensity of the light admitted to the photoelectric cell and the amplified output of the photoelectric cell was established by a separate experiment. For the measurements on the spectrum lines, every intensity measurement was referred to a standard lamp operated at a constant resistance. The absence of oscillations in the arc current was shown by a vacuum tube voltmeter." @default.
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- W2085750173 date "1931-05-15" @default.
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- W2085750173 title "A Direct Measurement of the Intensity Variations of the Helium Lines with Voltage" @default.
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- W2085750173 doi "https://doi.org/10.1103/physrev.37.1252" @default.
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