Do matter and antimatter obey the same laws of physics? One intriguing way to test this would be to compare the spectra of hydrogen and its antimatter twin: antihydrogen.
Both ALPHA and ASACUSA aim to measure precisely the spectrum of antihydrogen and compare it with that of hydrogen. Any small difference would cast light on the imbalance between matter and antimatter ...
As Dirac realized, there’s more to antimatter than antihydrogen.
Recently, the Japanese–European group made the first steps towards producing a low-velocity antihydrogen beam.
Jeffrey Hangst describes a new antihydrogen experiment at CERN.
The new method consists of exciting caesium atoms from an oven with two lasers, and then introducing the caesium into a positron trap.
This is an important step towards the goal of producing antihydrogen atoms cold enough – that is, slow enough – for precision spectroscopy.
Relying on ionization of the cold antiatoms when they pass through a strong electric field gradient, the ATRAP measurement provides the first glimpse inside an antiatom.