Well, I don't know much about Psionics, but it really has to do with the distinction between Psionics and Magic. First off, as far as I know, the only Psionic item creation feats are actual Item Creation Feats (such as Craft Psionic Arms & Armor). The Artificer never gets these feats, and thus would need to take them separately in order to begin to even think about making them. Second, is there a such thing as a Psionic Wand or Scroll (or corresponding Psionic item)? If so, can a non-Psion use them by making some sort of skill check (just as Use Magic Device can be used to employ a Scroll of Fireball or Wand of Light)? If another skill is needed, such as Use Psionic Item or something, then an Artificer would not, because he does not get Use Magic Device as a class skill, nor does the class specifically allow him to use Use Psionic Item to duplicate Powers. If Use Magic Device can be used to activate a Psionic item, then I'd say an Artificer could replicate them for purposes of item creation, but only if he acquires the requisite feats (such as Craft Psionic Arms & Armor). If there's no way to use Psionic items without being a Psion (i.e., no Use Psionic Item skill, or anything like that), then I'd say no.