Helium atom precision measurements and calculations have a history of nearly a century. In the 1960s, theorists discovered that the fine-structure split (23P0-23P2) of the 23P energy level of ...

In a feat of modern-day alchemy, atom tinkerers have fooled hydrogen atoms into accepting a helium atom as one of their own. The camouflaged atom behaves chemically like hydrogen, but has four ...

The pionic helium atom enables scientists to study pions in an extremely precise manner using laser spectroscopy. The research is published in this week's edition of Nature. The challenge the team ...

Researchers have now created a new type of artificial atom in which a helium nucleus is orbited not by an electron but by a pion. Helium is not just for party balloons. It is the second lightest ...