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Spectroscopy would be very cool.
Forming the atoms would not be that big of a deal, once you generate the particles. Generating and containing the particles is the really tricky bit. A single proton (or anti-proton, I would think) would want to pair-up with a free electron (or positron). It's a lower-energy state. I would be interested, if when they formed, that they then formed the antimatter version of H2. Because monatomic hydrogen is pretty rare. They generally form H2 very quickly. Again, I would assume antimatter would be similar. If they can, they should verify it.
