Graduate Centrifugal distortion of a diatomic molecule

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Centrifugal distortion constants (D, H, etc.) for diatomic molecules can potentially be negative at high vibrational distortions. However, practical examples of this phenomenon are rare, leading to questions about underlying limitations. The discussion highlights the unusual behavior of molecules in elevated vibrational states. There is a lack of familiarity with specific cases where negative constants have been observed. Overall, the topic raises intriguing questions about molecular behavior under extreme conditions.
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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