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    1. Which of the following statements about the energy (E) of absorbed or emittedphotons is correct for vibrational spectroscopy?
      1. E is the energy of the upper vibrational level
      2. E is the energy of the lower vibrational level
      3. E is the difference in energy between upper and lower vibrational levels
      4. E is kinetic energy of the electron
      5. None of the above
      please explain, thank you
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    You've posted this before. You got an answer.
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    The answer is 3. The excited photon falls back to the ground state and loses it's excitation energy in the form of a photon. Therefore the only energy that can be given out is the energy difference between the excited state and the ground state
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    (Original post by VanEkerDr)
    The answer is 3. The excited photon falls back to the ground state and loses it's excitation energy in the form of a photon. Therefore the only energy that can be given out is the energy difference between the excited state and the ground state
    The system can drop into any lower vibrational state, it does not necessarily have to be the ground state.
 
 
 
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