Centrifugal distortion of a diatomic molecule

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SUMMARY

Centrifugal distortion constants (D, H) for diatomic molecules can indeed be negative under conditions of high vibrational distortion. This phenomenon occurs when the vibrational states of the molecule reach sufficiently high energy levels, leading to unusual behavior. However, practical examples of negative centrifugal distortion constants are rare, suggesting that there may be underlying factors that prevent their common occurrence in observed molecular behavior.

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kelly0303
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Hello! Is it possible for the centrifugal distortion constants (D, H and so on) of a diatomic molecules to be negative? It looks like for high enough vibrational distortions they can be negative, but I don't think I've ever seen that in practice so I was wondering if there is something preventing that.
 
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kelly0303 said:
It looks like for high enough vibrational distortions they can be negative

Citation? I’m not familiar with any examples, but molecules in high vibrational states can be weird.
 

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