Antennas in Plasma II.
Final rept. 10 Oct 68-9 Oct 69,
SYLVANIA ELECTRONIC SYSTEMS-EAST WALTHAM MA APPLIED RESEARCH LAB
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The photometric method was used to determine the ionization frequency nu sub i in dry air. Relative to other investigations of the pulsed microwave breakdown, the nu sub ip versus E sub effp curve was shifted towards higher nu sub ip values in the lower range of E sub effp. For pressures below 8 Torr, breakdown of dry air was easier to initiate at room temperature but for higher pressures, the breakdown was facilitated at temperatures of the order of 1300K. At room temperature and in the pressure interval from 0.5 to 10 Torr the breakdown characteristics of NO and CO are quite similar. For CO heated to a temperature of 775K, two-body electron-ion recombination and ambipolar diffusion were found to be the only important electron removal mechanisms for pressures between 0.2 and 2 Torr. The ambipolar diffusion coefficient was found to be given by D sub a p sub o 372 sq cm Torrsec. Author
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