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An excitation unit for vacuum ultraviolet light sources based on a thyratron-controlled modulator has been developed to excite rare gas continua. With this unit the Hopfield helium continuum in the 580–1100 Å wavelength region is obtained with improved intensity and stability so that a bandwidth of slightly less than 0.25 Å can be used with a 2.2-m normal incidence vacuum monochromator and photo- electric scanning detection. The application of this excitation unit to study of the rare gas continua and to absorption cross-section measurements in hydrogen is illustrated.
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Huffman et al. (1965) studied this question.
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