Letter | Published:

Prevention of Reversal in Mercury-198 Lamps

Nature volume 180, page 1476 (28 December 1957) | Download Citation



THE green emission line 5461 A. of mercury-198 has been proposed by Meggers1 as a primary standard of wave-length, and is one of the lines being considered as the basis for a redefined international metre. The line has much to recommend it in its sharpness, isolation from other lines, convenience of excitation, etc.

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  1. 1.

    , and , J. Opt. Soc. Amer., 40, 737 (1950).

  2. 2.

    , “Fluorescence and Phosphorescence” (Interscience Publishers, Ltd., London, 1949).

  3. 3.

    , and , Canad., J. Phys., 35, 455 (1957).

  4. 4.

    , and , Rev. Mod. Phys., 8, 44 (1936).

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  1. Division of Applied Physics, National Research Council, Ottawa. Aug. 27.

    • K. M. BAIRD
    •  & D. S. SMITH


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