Methods for producing and exciting electrodeless discharge lamps of a variety of metallic vapors are discussed. The design of a resonant cavity for use with a 2450 megacycle microtherm unit in exciting the lamps is given. These lamps are long-lived and simple in construction and because of the great intensity of the principal lines, they are adaptable to photochemical uses. Satisfactory lamps were produced of lead indium, gallium, antimony, bismuth, mercury, cadmium, thallium, zinc, calcium, and barium.
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