They have to be trapped or held inside a special magnetic bottle.» (businessinsider.com)
Now Gerald Gabrielse, a physicist at Harvard University, has announced that his ATRAP team, also based at CERN, has created antihydrogen using a similar magnetic bottle. (sciencemag.org)
Radiating the antihydrogen atoms with microwaves allowed the physicists to determine its light fingerprint in a rather indirect way, using specific changes in the antihydrogen that caused them to eject from the magnetic bottle to fine tune estimates on its spectral lines. (businessinsider.com)