The second ingredient that is needed to create antihydrogen are antiprotons. The Antiproton, p, is the antimatter counterpart of a proton. Antiprotons can be produced in collisions involving cosmic rays, but do not occur on earth naturally. That’s why we need to produce them with the accelerators at CERN.
On February 19, 2020, ALPHA published the first investigation of the fine structure of Antihydrogen.
In 2018 the ALPHA Experiment was expanded with the addition of ALPHA-g. Look at timelapse videos to see the massive changes, from installation to beamline!
The ALPHA collaboration has for the first time observed single-photon excitation of antihydrogen atoms from the ground (1S) state to the 2P state using 121nm pulsed laser light - the so-called lyman-alpha line of the Lyman series.