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

Intense Resonance Line Sources for Photochemical Work in the Vacuum Ultraviolet Region

Hideo Okabe
J. Opt. Soc. Am. 54(4) 478-481 (1964)

Photoionization Cross Sections of Helium

James A. R. Samson
J. Opt. Soc. Am. 54(7) 876-878 (1964)

New Vacuum-Ultraviolet Emission Continua of Helium Produced in High-Pressure Discharges

R. E. Huffman, Y. Tanaka, and J. C. Larrabee
J. Opt. Soc. Am. 52(8) 851-857 (1962)

Some Applications of Microwave-Excited Electrodeless Discharge Tubes in Atomic Spectroscopy

R. M. Dagnall and T. S. West
Appl. Opt. 7(7) 1287-1294 (1968)

The Formation of Molecular Helium in a Glow Discharge*

W. D. Parkinson
J. Opt. Soc. Am. 41(9) 619-622 (1951)