Define Triatomic Molecule (Linear type) - QS Study
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In the case of triatomic molecule of linear type, the centre of mass lies at the central atom. It, therefore, behaves like a diamotic molecule with three degrees of freedom of translation and two degrees of freedom of rotation, totally it has five degrees of freedom (Figure).

Examples: molecules of CO2, CS2 etc.

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Fig. Triatomic molecules (linear type)