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Homework Help: Odd or even vibration modes?

  1. Oct 24, 2015 #1
    1. The problem statement, all variables and given/known data

    Good morning. I am currently doing an solid state problem; in this part, I have to tell if these vibration modes are odd or even. I am working at the lattice centre.
    The modes are these http://postimg.org/image/8nmv7ickz/.
    2. Relevant equations

    3. The attempt at a solution
    The centre of inversion is the blue cross; I have studied only two dimensional modes, so I don't have very clear how the three dimensional translations have to be done; I think it that this is what happens: http://postimg.org/image/xd01nfxr1/
    which would make both modes odd.
    Can someone please confirm this?
    Thanks for reading.
  2. jcsd
  3. Oct 29, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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