Question

Anharmonic oscillator with a brief explanation​

Answer 1

Answer:

A harmonic oscillator obeys Hooke's Law and is an idealized expression that assumes that a system displaced from equilibrium responds with a restoring force whose magnitude is proportional to the displacement. ... Anharmonic oscillation is described as the restoring force is no longer proportional to the displacement.

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Answer 2

Answer:

The selection rule in this case is Δv = 0, ±1, ±2, ±3,… In absorption, transitions may occur between a given vibrational state (v″) of the lower electronic state and any of the vibrational states (v′) of the upper electronic state giving rise to a so-called v′− progression.