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In page Atomic absorption spectroscopy:

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When a continuum radiation source is used for AAS, it is necessary to use a high-resolution monochromator. The lamp emits radiation of an intensity at least an order of magnitude above that of a typical HCL: wavelengths ranging from 190 nm to 900 nm. A special high-pressure xenon short arc lamp, operating in a hot-spot mode, has been developed to be used as the continuum radiation source.[citation needed]