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named for their relation to the visible spectrum. The higher-energy near-IR, approximately 14,000-4,000 cm^-1 (0.7-2.5 um wavelength) can excite overtone or combination modes of molecular vibrations. The mid-infrared, approximately 4,000-400 cm^-1 (2.5-25 um) is generally used to study the fundamental vibrations and associated rotational-vibrational structure.

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