Nature 164, 100-101 (16 July 1949) | doi:10.1038/164100a0

Discharges Excited by Microwaves

J. K. ROBERTSON ,  J. R. KENNEY &  W. C. NIXON

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BY means of a merchant marine radar set, Type 268, which develops microwaves of wave-length 3·2 cm., power from a pulsed-type 725A magnetron was fed through a rectangular wave-guide into tubes containing air, nitrogen, neon, argon, helium and mercury vapour. The peak power output was 40 kW., at a recurrence frequency of 500 cycles per second, the duration of a single pulse being 0·75 microsecond. A study of the resulting luminous discharges has revealed the following interesting features.