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inated by reducing the source bias voltage by an amount equal to the potential mismatch, i.e., the drift energy 8 eV. The dispersion when F 0 = 18.4 V (a drift is still evident for y 0 = 19 V) is shown by curve b in Fig. 3. I obtain a good fit to the data for u D = 0, T=0.54eV, and n 0 = n B {0.1 kG) (charge collection yields n 0 = 2.0x 10 6 cm" 3 ). In this case, no current is observed on the isolated tubes. The axial drift and the radial transport are reduced by adjusting the source parameters to conform with an allowable plasma equilibrium, in particular, with a plasma density below the Brillouin limit.In summary, we have produced an ion plasma in which ion Langmuir waves are observed. The density constraint imposed by the Brillouin limit is experimentally verified. Near this limit, the plasma waves have dispersion properties similar to those of a weakly magnetized neutral plasma.

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mogeneously distributed stresses that would induce splitting of the J= 1 level. 7 T A in solid H 2 with high concentrations of ortho was first calculated by T. Moriya and K. Motizuki, Progr. •.Theoret. Phys. (Kyoto) 18_, 183 (1957). The calculation has been repeated recently by A. B. Harris and E. Hunt, Phys. Rev. Letters 16_, 845 (1966).