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The bending normal mode for water occurs at about 1885 cm-1 in the infrared spectrum. Explain...

The bending normal mode for water occurs at about 1885 cm-1 in the infrared spectrum. Explain what happens when an H2O molecule absorbs infrared light of this frequency; that is, how is the vibrational motion of the molecule affected by the absorption of the infrared light?

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Answer #1

In general,

The vibrational modes of a molecule are quantised, so they occur at specific frequencies which correspond to the frequency of IR light. When the frequency of IR light matches the frequency of a particular vibrational mode, the IR light is absorbed, causing the amplitude of the particular stretch or bond bend to increase.

In the particular example, after the absorption of IR frequency of 1885 cm-1 , the amplitude of bending mode on water will be increased.

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