Abstract

A gas discharge is described which is powered by microwaves of frequency 2400 Mc/sec and which may be run at low power with sufficient stability for direct recording spectroscopy. Discharges in helium have been cooled with liquid helium; the rate of consumption of the coolant is very low and Doppler temperatures of 10°K have been obtained; under these conditions the discharge seems to be brighter than comparable dc discharges. The microwave discharge has also been operated cooled with liquid nitrogen and uncooled at room temperature.

© 1964 Optical Society of America

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