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Thermal Physics problem - please help

  1. Sep 27, 2011 #1
    1. The problem statement, all variables and given/known data

    Consider a CO2 molecule, which is linear and has vibrational modes with frequency
    corresponding to 2565 cm-1 (an asymmetric stretch), 1480 cm-1 (a symmetric stretch)
    526 cm-1 (bends). Sketch a curve showing how the constant volume heat capacity of CO2
    gas varies with temperature and mark the values of plateaus. (Recall: the spacing between
    rotational levels is smaller than the spacing between the vibrational levels).

    3. The attempt at a solution

    I think Z=[itex]\frac{1}{1-e^{-h\varpi/\tau}}[/itex] but after that I have problems with finding U so that I can find the heat capacity with: C[itex]_{v}[/itex]=[itex]\left(\frac{dU}{d\tau}\right)_{v}[/itex]
  2. jcsd
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