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Breakdown electric fields in a wave guide at 9500 Mc/sec frequency are presented for a number of neon‐argon mixtures at various pressures. The argon percentage is found to have a large influence on the breakdown electric field, just as Penning found for the dc discharge. For each argon concentration, only one minimum is found in the curves giving breakdown field as a function of pressure. This result contrasts with the two minima found in the dc discharge for some neon‐argon mixtures. This can be explained by the difference between the efficiency of energy transfer from the electric field to the electrons in the dc case and the high‐frequency case. The relation between the concentration of argon and the breakdown fields is discussed. The influence of electric field distortions and the standing‐wave ratio in the wave guide are investigated.