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Infrared Spectroscopy. Energy of photons in the IR region corresponds to differences in vibrational energy levels within molecules. Vibrational energy levels are dependent on bond types and bond strengths.
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Infrared Spectroscopy • Energy of photons in the IR region corresponds to differences in vibrational energy levels within molecules. • Vibrational energy levels are dependent on bond types and bond strengths. • IR is highly useful to determine if certain types of bonds (functional groups) are present in the molecule.