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Experimental study demonstrates a pure Lyman-α radiation source using a filtered radiofrequency lamp, highlighting monochromator-free vacuum ultraviolet generation.
A source has been developed which produces a pure spectrum of Lyman-α radiation (1215.7 Å). This source incorporates a wavelength selective filter and an rf-excited helium-filled lamp containing a mixture of uranium and uranium hydride in a sidearm. The uranium serves as a getter to eliminate atmospheric contaminants, and the uranium hydride, when heated, supplies H2 in a reproducible manner. The filter consists of a flowing-oxygen cell and a narrowband interference filter. The distinctive advantage of this device is that radiation in the VUV at a well-defined wavelength is obtained without the use of a monochromator. Characteristics of the source and measurements of the irradiance of the spectral line are given for a typical lamp. The irradiance and spectral purity are seen to be not strongly dependent on oxygen flow.
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Klose et al. (1985) studied this question.
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