What is the requirement for the vibrational mode of a molecule to be Raman active?

In Raman spectroscopy, a type of vibrational spectroscopy, a laser is used to excite the molecules in a sample and the scattered light is analyzed to determine the vibrational modes of the molecules. Raman spectroscopy can provide information about the chemical composition, molecular structure, and bonding of a sample. However, not all vibrational modes of a molecule are Raman active. In this context, the term "Raman active" refers to vibrational modes that can be observed in a Raman spectrum.

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