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Infrared spectrum of water
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The infrared (IR) spectrum of water exhibits two prominent absorption bands: a broad, strong band around 3400 cm⁻¹ due to the stretching vibrations of O-H bonds and a weaker band around 1640 cm⁻¹ corresponding to the bending vibration of the H-O-H bond. The broadness of the O-H stretching band is attributed to hydrogen bonding, which influences the vibrational frequencies of water molecules.
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