The admittance of a slotted-sphere antenna immersed in a tenuous plasma was measured at frequencies between 35 and 110 MHz in the region of resonance of the probe-plasma system. A set of antennas with radii R between 0.8 and 3.2 em was used. The electron density and temperature were varied thus allowing studies to be made over a range of the parameter R!Lo from 6 to 30, where Lois the Debye length. The approximate theoretical model of Harp (1964) for the p9si_tion of the resonance was compared with measurements and was foun<1 to be adequate for values of (R/Lo) > 15. The width of the resonance line .:l was essentially independent of gas pressure for pressures bel;,w I0-3 Torr but wa:. found to be a strong function of R and L0 . The empirical relation (Ll(wp) where Wp is the plasma frequency, fits the observations. Some form of collisionless damping causes the observed line broadening.
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