the reigning model that describes the zoo of subatomic particles. In research published in April in the journal Physical Review Letters, physicists zapped a container of helium atoms with ...

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 ...

The atom is neutral as it has two positive protons and two negative electrons. A helium atom that has lost or gained an electron is an ion. The ion has two positive protons but one electron so it ...

It inspired Niels Bohr’s groundbreaking model of the atom in the early ... extensive experience of studying another exotic helium-type atom, in which one electron was replaced by an antiproton ...

a chemist at the Skolkovo Institute of Science and Technology in Russia and leader of the group that initially discovered the helium compounds. “This model is predictive and it explains all the ...

Physicists have created the first-ever atomic vortex beam — a swirling tornado of atoms and molecules with mysterious properties that have yet to be understood. By sending a straight beam of ...