# Resonant and Non Resonant Susceptibility

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The imaginary part of the $$\chi ^3$$ susceptibility can be split into the resonant and non resonant contributions.
The resonant is the contribution from satisfying a resonant vibrational state/mode, but what contributes to the non resonant term?

## Answers and Replies

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The imaginary part of the $$\chi ^3$$ susceptibility can be split into the resonant and non resonant contributions.
The resonant is the contribution from satisfying a resonant vibrational state/mode, but what contributes to the non resonant term?

everything else, apparently.