Abstract

Possible changes of intensity of cadmium arc lines, emitted from different upper energy states, have been calculated on the basis of thermal equilibrium for two definite temperatures of the arc due to variation of the arc current. The arc temperatures were measured with optical pyrometers. Large discrepancies were noted between the calculated and observed values. The results call for a considerable amount of collisional excitation.

© 1956 Optical Society of America

Anode Temperatures and Characteristics of the dc Arc in Noble Gases*†

Bert L. Vallee and Milton R. Baker
J. Opt. Soc. Am. 46(2) 77-82 (1956)

Effect of Alkali and Alkaline Earth Chlorides on the Anode Temperature of the dc Arc*

Bert L. Vallee and Ralph E. Thiers
J. Opt. Soc. Am. 46(2) 83-86 (1956)

Energy Levels and Wavelengths of Natural Cadmium and of Cadmium-114

Keivin Burns and Kenneth B. Adams
J. Opt. Soc. Am. 46(2) 94-99 (1956)

Spectral Radiance of the Carbon Arc from 1900 to 2500 Angstroms

Francis S. Johnson
J. Opt. Soc. Am. 46(2) 101-103 (1956)

Physical Basis of Line Enhancement in Argon and Krypton*

Milton R. Baker, S. James Adelstein, and Bert L. Vallee
J. Opt. Soc. Am. 46(2) 138-140 (1956)