Question

short note on isotopic effect on rotational spectroscopy?​

Answer 1

Answer:

the isotopic shift of the rotational lines is proportional to the ratio of the reduced masses. The rotational lines can be observed in the far infrared region and the rotational spectra can be used for the determination of bond lengths in molecules.

Answer 2

Isotopic effect on Rotational Spectroscopy

• The isotopic shift of the rotational lines is proportional to the ratio of the reduced masses and these rotational lines may be observed within the far-infrared region still because the rotational spectra can be used for the determination of bond lengths in molecules, methods of optical molecular spectroscopy in 1929.
• The energy and therefore the energy gap between two rotational energy levels of a molecule depends on the isotopic mass of the atoms, also the energy and energy gap of a rigid diatomic molecule are reduced with the increasing mass of isotope.