The helium atoms are then ionized by the absorption of a single ultraviolet photon, the energy of which is tuned such that it is only just enough to ionize the helium – 99.9% of the photon’s energy is ...

But when compounds contain unequal numbers of negatively and positively charged ions, repulsion between atoms with the same charge may drive the structure to become unstable under pressure. That’s ...

Helium, a noble gas, was long believed to be 'too aloof' to react with the other elements on the periodic table. Now, however, scientists have provided a theoretical explanation of how helium may ...

Helium is the second-most common element in the observable universe and along with neon, is one of the only two elements with no known stable chemical compounds. INTERNATIONAL BUSINESS TIMES.

The charge radius is a statistical measure of how far the electric charge of a particle extends into space. Both groups were ...

And indeed, upon inspection, helium atoms were found between iron atoms in the lattice structure—the iron actually contained up to 3.3 percent helium at the end of the experiment, confirming ...

The spectroscopic signatures of the molecular ions were almost identical to those of bare ions, without helium surrounding them. “This finding indicates that we can directly compare measurements on ...