A schematic energy level diagram of a polyatomic molecule is shown in Fig. 12.1
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Fig. 12.1 Molecular energy levels. Electronic energy levels are shown by thick lines, vibrational energy levels are shown by dashed lines and rotational energy levels are shown by dotted lines. The quantum numbers corresponding to electronic and rotational levels are shown on the left and the quantum numbers for the vibrational levels are shown on the right.
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