Resonant radiation and moving striations in an argon glow discharge.
Eure, Samuel Lee.
Cooper, A. W.
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A study of the argon glow discharge, to include determining the discharge conditions for maximizing the intensity of 8115A˚ radiation; observing the effects of external radiation and the absorption of the 8115A˚ line was conducted. Discharge tubes having diameters of 25 and 35 mm, with gas pressures in the range of 0.5 mm to 13.0 mm Hg were used. The intensity of the 8115A˚ line was observed to increase with increase in current and pressure. A small increase in frequency of moving striations was observed with the glow discharge was irradiated with another argon glow discharge, but no increase was noted when the 8115A˚ radiation passed through the discharge. No changes were found in striation wavelength, amplitude or the discharge potential, when the main discharge was subjected to radiation composed of the entire argon spectrum, or to single line irradiation with 8115A˚. The results of the absorption experiment indicate that there is more attenuation of the beam of 8115A˚ radiation when the main discharge is operated at low currents than at high currents. This may correspond to a denser population of 4S₁₂ metastable atoms at low currents than at high currents, which would indicate a strong dependence of moving striations on metastable concentrations.
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