Abstract
HOLLOW-CATHODE and high-frequency discharges are the light sources commonly used in optical spectral analysis of isotopic composition. Both these light sources have been used with an oscillating Fabry–Perot spectrometer in a determination of isotope abundance in mercury1–3. The hollow-cathode lamp appeared to exhibit anomalous variations in the spectral intensity of the odd isotope components, the magnitude of the variation depending on the discharge current strength, so a high-frequency discharge lamp was used exclusively in this work. Similar anomalous spectral intensity modifications have been reported by Schuler and Keystone4, and by Murakawa5, who used Fabry–Perot rings with photographic detection and consequently with less accuracy in spectral intensity measurement. The intensity variations have been further examined with an oscillating Fabry–Perot spectrometer with photo-multiplier detection and oscilloscope recording.
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Schuler, H., and Keystone, J. E., Z. Phys., 71, 413 (1931).
Murakawa, J., Inst. Phys. and Chem. Res. Sci. Papers, 398, 1 (1932).
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BRADLEY, D. Anomalous Spectral Intensity Modification in a Hollow-Cathode Discharge. Nature 194, 967 (1962). https://doi.org/10.1038/194967a0
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DOI: https://doi.org/10.1038/194967a0
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