Abstract
IN a recent communication1, Dr. E. B. Armstrong gave an account of some new facts concerning the oscillations with frequencies of order of 1,000 mega-cycles/sec, and upwards which are generated internally in a low-pressure hot-cathode discharge. In this he stated that it was probable that at least two processes were occurring, namely, a vibration of plasma-electrons in a small volume close to the cathode, and velocity modulation of primary electron beams passing through this.
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References
Armstrong, E. B., Nature, 160, 713 (1947).
Webster, J. App. Phys., 10, 864 (1939).
Merrill and Webb, Phys. Rev., 55, 1191 (1939).
Schumann, Z. Phys., 121, 7 (1942).
Tonks and Langmuir, Phys. Rev., 33, 954 (1929).
Druyvesteyn and Warmoltz, Physica, 4, 51 (1937).
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NEILL, T. Plasma-Electron Oscillations. Nature 163, 59–60 (1949). https://doi.org/10.1038/163059a0
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DOI: https://doi.org/10.1038/163059a0
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