Interpretation:
The reason as to why rotational spectrum cannot be observed for the rotation of a linear molecule about its linear axis is to be stated.
Concept introduction:
An electronic state of energy has its own vibrational states. The energy between the electronic states is large followed by vibrational states and then rotational states. During an electronic transition, electron from ground state moves straight to the excited state keeping the internuclear distance constant. This is known as the Franck-Condon principle.

Answer to Problem 14.1E
The rotational spectrum for the rotation of a linear molecule about its linear axis is not observed because when a linear molecule is rotated along its linear axis, the position of dipole remains unchanged.
Explanation of Solution
The rotational spectrum for a molecule is observed when the rotation of molecule changes the position of dipole. When a linear molecule is rotated along its linear axis, the position of dipole remains unchanged. Therefore, the rotational spectrum is not observed for rotation of a linear molecule.
The rotational spectrum for the rotation of a linear molecule about its linear axis is not observed because when a linear molecule is rotated along its linear axis, the position of dipole remains unchanged.
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Chapter 14 Solutions
Student Solutions Manual for Ball's Physical Chemistry, 2nd
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