What Does the Vibrational Mode Analysis Reveal About the Geometry of (NO)2+?

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Homework Statement


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?




The Attempt at a Solution


Never mind, I think I got it :)
 
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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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