A Centrifugal distortion of a diatomic molecule

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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