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Temperature for "melting" vibrational degrees of freedom

  1. Feb 7, 2016 #1
    Hello everyone!
    I recently read some information about the equipartition theorem and degrees of freedom in thermodinamics. I read that for the linear N-atomic and non-linear N-atomic molecules in order to allow the vibrational degrees of freedom to appear we need a really high temperature.
    I was curious , because I didn't find the value, at about what temperature do those degrees of freedom appear , what is the order of magnitude of the temperature?

    Thank you !
     
  2. jcsd
  3. Feb 7, 2016 #2
    What are N-atomic molecules?
     
  4. Feb 7, 2016 #3
    Molecules with N atoms
     
  5. Feb 7, 2016 #4
    For a diatomic molecule the vibrational heat capacity reaches the classical limit for tempratures larger than (ħω/kB) . See for example the first 3 pages of these lecture notes:

    http://ocw.mit.edu/courses/physics/...fall-2013/lecture-notes/MIT8_333F13_Lec20.pdf

    It is possible to make similar analysis for poly-atomic molecules.
     
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