Abstract
New developments are described for the absolute calibration of light intensities in the far ultraviolet. First, we use the microwave cavity as an (almost) monochromatic light source, determining the intensity of its radiation with a thermopile. Secondly, we apply the branching ratio method for molecules. Next we describe two methods which are based on the fact that some cross sections for emission of spectral lines in the vacuum ultraviolet, produced by electron impact on gases, can be theoretically or empirically calculated.
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