I found this paragraph on Wiki. "Rydberg atoms in plasmas Rydberg atoms form commonly in plasmas due to the recombination of electrons and positive ions; low energy recombination results in fairly stable Rydberg atoms, while recombination of electrons and positive ions with high kinetic energy often form autoionising Rydberg states. Rydberg atoms' large sizes and susceptibility to perturbation and ionisation by electric and magnetic fields, are an important factor determining the properties of plasmas.[16]
Condensation of Rydberg atoms forms Rydberg matter most often observed in form of long-lived clusters. The de-excitation is significantly impeded in Rydberg matter by exchange-correlation effects in the non-uniform electron liquid formed on condensation by the collective valence electrons, which causes extended lifetime of clusters.[17] So it does seem hydrogen plasmas would easily recombine into Rydberg atoms. Does this mean sparks would be a good way to create Rydberg atoms? Oh, how I wished I had Axil's understanding right now.
