Question

How many Vibrational degrees of freedom does a diatomic/triatomic linear molecule have?

Answer 1

Hey mate

Here is your answer

A diatonic gas molecule has "6" degrees of freedom.

This set may be decomposed in terms of translation,rotation and vibrations of the molecule.

Answer 2

Hey !

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A diatomic molecule has altogether 6 degrees of freedom. Three of them are translations, which leaves three. Of these three one is a vibration.

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Thanks !