• Modes of vibration of the hexagonal close-packed lattice

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/018/05/0341-0344

    • Keywords

       

      Hexagonal; Axial Ratio; Character Table; Perpendicular Plane; Prismatic Plane

    • Abstract

       

      The modes of vibration of the hexagonal close-packed structure is worked out on the basis of the Raman theory of crystal vibrations. The character tables are drawn up, and the vibrations are derived by a method due to E. V. Chelam without using the character table of the space-group. It is found that there are 13 vibrations with degeneracies 1, 2, 2, 4, 3, 3, 3, 3, 3, 3, 6, 6, 6. The planes which take part in each mode and the directions of vibration for these are also described.

    • Author Affiliations

       

      G N Ramachandran1

      1. Department of Physics, Indian Institute of Science, Bangalore
    • Dates

       
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