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- W2047060989 abstract "The linear amplifier photo-cell unit from a Razek-Mulder spectrophotometer is used with a high speed monochromator to measure the relative intensity of helium spectrum lines under various conditions of excitation; the discharge is developed in a copper ball 10.5 cm in diameter. A linear relation is found between arc current and line intensity for a series of voltages between the excitation potential and 100 volts, and from this family of curves a family of excitation functions is drawn for a range of currents up to thirty milliamperes. The voltage intensity relation for eight helium lines (4388, 4438, 4471, 4713, 4922, 5016, 5876, 6678) was determined directly. The results check those of Razek up to 50 volts and those of Elenbaas over the entire range, although secondary maxima are indicated in the region between the ionization potential and 45 volts. Additional experiments show that the cathode surface plays a part in determining the character of the discharge, and that the rise in Razek's curves was caused by the discharge changing to the self-maintaining form; the hysteresis observed by him is eliminated by the use of a two-grid electron source." @default.
- W2047060989 created "2016-06-24" @default.
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- W2047060989 date "1938-06-15" @default.
- W2047060989 modified "2023-09-26" @default.
- W2047060989 title "Intensity Relations in the Low Voltage Helium Arc" @default.
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- W2047060989 doi "https://doi.org/10.1103/physrev.53.977" @default.
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