Question

Discuss the effect of isotopic substitution on the rotational spectra of diatomic molecule​

Answer 1

Explanation:

The energy and the energy gap between two rotational energy levels of a molecule depends on the isotopic mass of the atoms. The energy and energy gap of a rigid diatomic molecule are reduced with the increasing mass of isotope.

Answer 2

1. The study of pure rotational motion of molecules is the focus of microwave spectroscopy.
2. When the energy absorbed by the molecule is so low that it can only cause a transition from one rotational level to another within the same vibrational level, rotational spectra are obtained.
3. A diatomic molecule's rotational spectrum is made up of a series of equally spaced absorption lines, which are typically in the microwave region of the electromagnetic spectrum.
4. Isotopic substitution is a useful technique because the normal modes of an isotopically substituted molecule differ from those of an unsubstituted molecule, resulting in different vibrational frequencies for the substituted atoms.

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