Letter | Published:

A Christiansen Filter for the Ultra-violet

Nature volume 158, page 788 (30 November 1946) | Download Citation



THE type of colour filter developed by Christiansen1 consists of a powdered transparent solid (for example, glass) immersed in a liquid of about the same refractive index but with a different dispersion. For one particular wave-length the refractive index of the liquid and solid will be exactly the same, and this wave-length will be transmitted, while other wave-lengths for which the refractive indices are not quite the same will be scattered by the powder and so not transmitted. The theory of these filters has been discussed by Sethi2, and Kohn and Fragstein3 used a filter of amorphous silica in a mixture of 56 per cent benzene with 44 per cent ethanol to isolate the Hg line 3650 A. There does not appear to be any record of work farther in the ultra-violet, and it seems desirable briefly to report our attempts to develop a filter to transmit the 2537 A. line of Hg. This was required for quantitative measurements on the absorption of hydrogen peroxide produced during certain combustion processes.

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  1. 1.

    , Ann. Phys. Lpz., 23, 298 (1884).

  2. 2.

    , Ind. Assoc. Cult. Sci. Proc., 6, 121 (1921).

  3. 3.

    , and , Phys. Z., 33, 929 (1932).

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  1. Chemical Engineering Department, Imperial College, London, S.W.7. Nov. 1.

    • G. J. MINKOFF
    •  & A. G. GAYDON


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