Abstract
The variation of radiofrequency (8.9 MHz) electric field breakdown of gases like air, hydrogen and oxygen is obtained, for gas pressures of 0.25, 0.5 and 0.3 Torr respectively, in the presence of a steady external uniform magnetic field varying from zero to 3 kG, the magnetic field being transverse to the electric field direction. For each gas a minimum value of the breakdown field is found at a certain value of the magnetic field. In addition, in a strong magnetic field when the electron cyclotron frequency is much higher than the electron-neutral collision frequency, both being much higher than the frequency of the applied field, a second breakdown field of much lower magnitude was found. The theory of high-frequency electric field breakdown is modified by taking the 'equivalent pressure concept' of Belvin and Haydon (1958) in the presence of a magnetic field. An attempt is also made to explain the experimental observations by analysing the motion of electrons in an E*H field configuration without using the equivalent pressure concept.
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