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Raman Spectra of Decahydro- and Tetrahydro-Naphthalene


THE Raman spectra of decahydro- and tetrahydro-naphthalene have been studied by me with the view of recording the faint lines and assigning the frequencies correctly. These liquids were studied previously by G. B. Bonino and P. Cella1, who reported a large number of lines for each of these substances. Whenever a substance has a large number of Raman lines, and if no suitable filter is used to cut off the light of the 4046 group of lines of the mercury arc, and only one strong mercury line is used as the exciting line, for example, the 4358.8 A. mercury line, there is always the possibility of wrong assignment. Hence, in the case of such substances it is desirable to use a suitable filter to cut off the 4046 group of mercury lines. After trying several filters one after another, I found ultimately a filter of m-dinitrobenzene dissolved in suitable proportions in benzene to be very efficient in weakening consider ably the 4046 region of the mercury arc. This filter had previously been used very successfully by R. Bär2, using carbon tetrachloride as the scattering liquid.

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  1. 1

    Rendiconti Reale Accad. Roma, 13, 784; 1931. Also, Atti. Accad. Lincei, 15, 572–576; April 3, 1932.

  2. 2

    Helv. Phys. Acta, 5, 174; 1932.

  3. 3

    Loc. cit.

  4. 4

    Ind. J. Phys., 6, 543; 1932.

  5. 5

    Ind. J. Phys., 5, 515; 1930.

  6. 6

    "Investigations of Infra-red Spectra". Carnegie Inst. (1905).

  7. 7

    R. Bär, NATURE, 124, 692, Nov. 2, 1929.

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