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Ellis and Randy Are Looking at a Molecular Absorption Spectrum Δ\Delta

question 45

Multiple Choice

Ellis and Randy are looking at a molecular absorption spectrum.The spectral lines appear to fall into two groups with a gap in the middle.Ellis says that this must be an absorption spectrum for transitions between the v = 0 and v = 1 vibrational states of a diatomic molecule.Randy says the gap in the middle must occur because a Δ\Delta J = 0 transition is forbidden.Which one, if either, is correct, and why?


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