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Rotational Spectroscopy Question

  1. Oct 22, 2013 #1
    Which of the following molecules can be studied by purely rotational spectroscopy?

    a) NH3 b) N2 c) CH4 d) SF6 e) CS f) CS2

    The attempt at a solution[/b]

    To my understanding, using only rotational spectroscopy could be used to study b) N2 and e) CS but I am not sure about my answer. Would the lack of a dipole for N2 make it unfit? Any help would be greatly appreciated.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 22, 2013 #2

    ehild

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    http://en.wikipedia.org/wiki/Rotational_spectroscopy

    Which of the molecules above posses dipole momentum?

    ehild
     
  4. Oct 22, 2013 #3
    Thank you! Now I feel confident that e) CS is the answer
     
  5. Oct 23, 2013 #4

    ehild

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    What about NH3?

    The NH3 molecule has a large dipole moment, and this is consistent with its geometry, a triangular
    pyramid.
    http://en.wikipedia.org/wiki/Ammonia

    ehild
     
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