Question

Calculate fundamental modes of vibration in diatomic molecules

Answer 1

Answer:

The number of vibrational modes (different types of vibrations) in a molecule is 3N-5 for linear molecules and 3N-6 for nonlinear molecules, where N is the number of atoms. So the diatomic molecule we just discussed has 3 x 2 - 5 = 1 vibration: the stretching of the bond between the atoms.

Answer 2

The fundamental mode of vibration in diatomic molecules is one.

Explanation:

• In diatomic molecule, it contains only a single motion.
• But polyatomic molecules, exhibit more complex vibrations, which is known as normal modes.
• The number of vibrational normal modes in a diatomic molecule can be calculated for any molecule by the formula.
• The number of modes for a nonlinear molecule will be determined as  3N−6  and that for the case of a linear molecule is 3N−5 .
• For a diatomic molecule, where N = 2 then the number of modes will be  3×2−5=1.
• Thus a diatomic molecule has one normal mode of vibration, which will be only stretch or compress the single bond.

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