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Instrumentation for Combined Dispersion and Absorption Measurements in the VUV.

When the hook method that measures anomalous dispersion is combined with photoelectric photometry, a particularly powerful tool results. An apparatus that combines these techniques over a wavelength range extending into the vacuum ultraviolet has been constructed and used chiefly on the iron-group elements. It consists of hydrogen-discharge light source, a Mach-Zehnder interferormeter, a high temperature furnace, a stigmatic spectrograph, and a photoelectric photometer.