A much denser state exists for deuterium, named D(-1). It is called
ultra-dense deuterium. This is the inverse of D(1), and the bond distance is
very small, equal to 2.3 pm (0.023 angstroms). Its density is extremely
large, >130 kg / cm3 (130,000 times as dense as water), if it can exist as a
dense
Holmlid's Inverted Rydberg hydrogen in not an ion, per se. But to answer
Robin's question, the "decrease in volume" would be the end-game event which
destroys the 2D form, allowing ZPE coherence.
BTW - Out of respect to a famous scientist, Rydberg's name should be spelled
correctly (and as a notor
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