Abstract
IN much of the early spectroscopic literature the photographic density (measured or estimated by eye) of spectral features is reported, in addition to wavelengths, as an aid to identification. In many molecular band systems in the vacuum ultra-violet region (which are becoming of increasing interest in astrophysics and plasma physics and the intensities of which, in emission, are relatively difficult to measure) the early data on photographic blackening are still the only experimental information on band intensities available.
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