Abstract
The range of spectrometers can be extended to wavelengths shorter than 3000 Å in the ultraviolet without modifications which would impair their versatility at longer wavelengths by using an intense source and filtering out the scattered light in the visible and near ultraviolet. An absorption filter composed of nickel sulfate hexahydrate and Corning 9863 glass is described which extends the range of an absolute reflectometer having over thirty reflections and employing a single-beam, double-pass monochromator to about 2400 Å.
© 1964 Optical Society of America
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