IGNOU MCH 20 2026 - Explain why the spin splitting is not observed in &nbs

Question

Explain why the $^{13}\text{C-}^{13}\text{C}$ spin splitting is not observed in $^{13}\text{C-NMR}$ spectrum?

21 Jan 2026

Answer :

Word Count : 262

In an electronic spectrum the energy levels of atoms arise mainly from electronic configurations characterized by the principal, orbital and spin quantum numbers. Spin splitting refers to the separation of spectral lines due to spin–orbit interaction, which arises from the coupling between the electron’s orbital angular momentum and its spin angular momentum. In principle, this interaction should split a given electronic energy level into closely spaced sublevels with different total angular momentum quantum numbers. However, in ordinary electronic spectra this spin splitting is generally not observed. This is because the magnitude of spin–orbit coupling is relatively small compared to the large energy differences between electronic

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