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The absorption of helium excited at low voltages for its own lines, the 2 S 3 - 2 P 3 at 10830A and the 2 S 1 - 2 P 1 at 20582A, is determined. The percentage absorption of the 2 S 3 - 2 P 3 line increases when either the exciting current or the pressure in the absorbing tube is increased, and also when either the current or the pressure in the source tube is decreased. When the light to be absorbed is taken end on from a Geissler tube source, the percentage absorption is much less than when the light is taken off at right angles to the capillary. The changes with source tube conditions are ascribed to the corresponding variations of the shape and width of the emission line. Observable absorption begins when the exciting voltage is 25 volts. No absorption is detected at 19.8 volts, the excitation potential of the 2 S 3 state. The 10830A line shows strong resonance which is directly proportional to the percentage absorption. The absorption for the 20582A line is very small. It shows no detectable resonance.
Physical Review – American Physical Society (APS)
Published: Mar 1, 1932
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