Spectral Radiance of a Low Current Graphite Arc

The spectral radiance of the anode of a low current graphite arc has been determined throughout most of the 850-210 nm region by utilizing a recently developed high accuracy spectroradiometer. The estimated standard deviation uncertainty varies from about 1.5% at the longer wavelengths to about 5% at the shorter. Results are given at twenty wavelength points in the region and also as a continuous function of wavelength throughout most of the region, excluding some areas of high molecular band radiation originating in the arc stream.