(a)
Interpretation:
An expression for the wave numbers of allowed rotational transitions has to be stated.
Concept introduction:
A rotational spectrum is a spectrum in which only the rotation of molecule changes. For a molecule to exhibit pure rotational spectrum, the molecule must possess a permanent electric dipole moment. The molecules on rotation tend to experience a centrifugal force, this centrifugal force brings about a change in the molecular geometry and the moment of inertia of molecule. This centrifugal distortion affects the energy relation to give the equation as shown below.
(b)
Interpretation:
The values of constants
Concept introduction:
As mentioned in the concept introduction in part (a).
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