Question

What happens when molecules absorb infrared radiation

Answer 1

Answer:

When molecules absorb IR radiation, transitions occur from a ground vibrational state to an excited vibrational state (Figure 1). For a molecule to be IR active there must be a change in dipole moment as a result of the vibration that occurs when IR radiation is absorbed.

Explanation:

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Answer 2

Answer:

• The atoms of a molecule are in a state of constant vibratory and rotatory motion.
• During the absorption of infrared radiation by molecules, there occur transitions from a ground vibrational state to an excited vibrational state.
• The amplitude of vibration increases upon absorption of energy by a bond.
• There is a change in the dipole moment of molecules when vibrations occur during the absorption of infrared radiations.
• The expansions and contractions of bonds in a molecule change its dipole moment.
• A specific functional group will absorb a certain range of frequency.