The infra-red absorption spectrum of diamond and its variations

  • K. G. Ramanathan


The infra-red absorption spectra of nine cleavage plates of diamond have been investigated in the region of frequencies between 750 and 4000 cm.−1 and their observed spectral behaviours have been elucidated. While the second-order spectrum is similar for all diamonds, the first-order spectrum shows large variations. From the nature of these variations it is concluded that the first-order activity is due neither to chemical impurities nor to mosaicity of structure, but must be attributed to the tetrahedral symmetry of structure possessed by such diamonds.


Rocksalt Tetrahedral Symmetry Octahedral Plane Bunsen Flame Order Band 


  1. 1.
    Ramachandran, G. N.Proc. Ind. Acad. Sci., A 1946,24, 65.Google Scholar
  2. 2.
    Ramanathan, K. G.Ibid., A 1946,24, 150.Google Scholar
  3. 3.
    Ibid., A, 1947,26, 493.MathSciNetGoogle Scholar
  4. 4.
    Rawlins and TaylorInfra-Red Analysis of Molecular Structure, 1929.Google Scholar

Copyright information

© Indian Academy of Sciences 1947

Authors and Affiliations

  • K. G. Ramanathan
    • 1
  1. 1.Department of PhysicsIndian Institute of ScienceBangalore

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