Consider the molecule Br2.  The energy (in cm-1) required to excite Br2 from the ground vibrational state to the 1st excited vibrational state is 323.2 cm­-1.  Is this molecule IR active?  Is the molecule Raman active?  Explain?

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Chapter15: Introduction To Electronic Spectroscopy And Structure
Section: Chapter Questions
Problem 15.58E
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Consider the molecule Br2.  The energy (in cm-1) required to excite Br2 from the ground vibrational state to the 1st excited vibrational state is 323.2 cm­-1. 

  1. Is this molecule IR active?  Is the molecule Raman active?  Explain?
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