Letter | Published:

Width of the Green Mercury Line from a 198-Isotope Lamp


IN recent years the mercury isotope lamp has been found most useful and convenient for producing fairly bright and extremely sharp emission lines for spectroscopic purposes. Only a fraction of a milligram of mercury-198 is needed for a discharge lamp of this kind, and this isotope can now be produced quite cheaply from gold. This light source has with good reason been proposed for use as a primary standard of wave-length1.

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    Baird, K. M., and Smith, D. S., Nature, 180, 1476 (1957).

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    Baird, K. M., and Smith, D. S., Canad. J. Phys., 35, 455 (1957).

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    Research Laboratories, General Electric Co., Ltd., Wembley, Middx., Drg No, T 50—375 F (1950).

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    Redman, R. O., and Suemoto, Z., Mon. Not. Roy. Astro. Soc., 114, 524 (1954). Jarrett, A. H., and von Klüber, H., ibid., 115, 269 (1955). Von Klüber, H., Naturwiss., 43, 28 (1956).

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    Jarrett, A. H., and Von Klüber, H., Nature, 169, 790 (1952). Jarrett, A. H., Z. Astrophys., 34, 91 (1954).

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