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Homework Help: Raman and IR spectroscopy

  1. Aug 5, 2007 #1
    1. The problem statement, all variables and given/known data
    For (NO)2+, experiments show 1 Raman active vibrational mode around 1450/cm; 2 strong IR active modes at 2400/cm and 550/cm; and 1 weak IR active mode around 3600/cm. What does that say about its geometry?

    3. The attempt at a solution
    Never mind, I think I got it :)
    Last edited: Aug 5, 2007
  2. jcsd
  3. Aug 6, 2007 #2


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    Out of curiosity, what kind of mode does the weak IR active line correspond to?

    The first 3 are clearly the symmetric stretch, asymmetric stretch and symmetric bend (in that order). That there are 4 modes suggests that the ion is linear, as indeed NO2^+ is. What is the fourth vibrational mode?
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