I'm aware that there are certain unique configurations of atoms often referred to as exotic atoms. One type of these atoms involves the substitution of an electron with a muon in hydrogen. The relatively large mass of the muon results in the size of the hydrogen atom decreasing (which is the basis for the impractical muon-catalyzed fusion). Now, a friend of mine claimed that it should be possible to replicate the muon's substitution effect on the hydrogen with a quasiparticle known as a plasmon substituting for the electron. Is it possible for a plasmon to substitute for an electron and form some kind of quasi-atom? Also, if it is possible, would it result in the same effect that substituting with a muon would have? I know that when substituting with a muon, you can use the same equations that describe normal hydrogen but replace the electron mass with the muon mass. Assuming a quasi-atom was possible, would it need modified equations and what would you use for the mass? A big reason I'm skeptical of his claim is because it seems like he's trying to advocate for some kind of alternative fusion method and I'd like to understand this idea so I can critique it. Thank you for any help in understanding this matter.