A method has been devised for testing ultraviolet monochromators for nearby stray radiation i.e., the stray radiation with wavelengths close to that of the dispersed radiation. The method is based on the observed transmittance of the very narrow 2537 A absorption peak of saturated mercury vapor at elevated temperatures. The usual method of determining stray radiation does not detect nearby stray radiation because the peak normally used for the measurement is so broad as to absorb this radiation. Nearby stray radiation is particularly objectionable in the recording of absorption spectra of the very sharp peaks observed at low temperature and in the spectra of vapors.
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