Abstract

The spectral relationships of background radiation and sample composition have been studied for synthetic glasses (2500–3500 Å) and sulfates of alkaline earths (2900–4700 Å) in gas-stabilized dc arcs (15–28 A). The influence of lithium metaborate as a spectrochemical buffer on background radiation and on evaporation of the alkaline earths has been examined. This buffer was found to improve the reproducibility of line intensities. The spectral distribution of the relative background intensity has been determined with the aid of the standard radiation of the carbon anode crater and compared with other authors' results. Electron recombination and molecule continua substantially contribute to continuous radiation. The background intensity was found to be at least as good a reference as an internal standard, particularly because it is applicable for quite a wide spectral range.

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)

Ultraviolet Radiation of the High Pressure Xenon Arc*

William A. Baum and Lawrence Dunkelman
J. Opt. Soc. Am. 40(11) 782-786 (1950)

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)

Spectral Radiance of the Carbon Arc Between 2500 Å and 1900 Å

E. Pitz
Appl. Opt. 10(4) 813-818 (1971)

The Measurement of Spectral Intensities in the Direct Current Arc*

Robert R. Hampton and H. N. Campbell
J. Opt. Soc. Am. 34(1) 12-20 (1944)