Title: EXPERIMENTAL INVESTIGATION ON THE AMBIPOLAR EFFUSION FROM THE POSITIVE COLUMN
Abstract:In an effusion method for ion extraction from the positive column in a low-pressure gas discharge in which the use of metal parts and voltage fluctuations inside the plasma was avoided, the ion effusi...In an effusion method for ion extraction from the positive column in a low-pressure gas discharge in which the use of metal parts and voltage fluctuations inside the plasma was avoided, the ion effusion current was determined in the undisturbed plasma. Measured effusion currents (some 10/sup -9/ amp) from a helium discharge with different discharge current strengths (1.5 to 6 ma) and dischange pressures (0.2 to 3.9 torr) were given and compared with the values calculated for the Schottky case from the theory of ambipolar effusion. The measured intensities of the effusion current and its dependence on the discharge parameters were described by this theory. The ion current from a neon discharge was analyzed with a mass spectrometer. The ion currents from Na/sup 20/ and Na/sup 22/ were within the measurement accuracy ( plus or minus 2%), as was the natural isotopic mixture ratio of Ne/sup 20/ to Ne/sup 22/, so that a possible mass separation by the effusion jet could not be detected. (tr-auth)Read More
Publication Year: 1958
Publication Date: 1958-04-01
Language: en
Type: article
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