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 ...

Helium, the second-lightest element in the universe, has a variety of uses, from keeping balloons afloat to cooling superconducting magnets. It is also a noble gas — so labeled because it was long ...

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

Made up of one sulfur atom and six fluorine atoms, sulfur hexafluoride is often called by its chemical formula SF 6.This non-flammable gas is colorless and odorless, and it's also denser and has a ...

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 ...

image: Helium may play a 'nanny' role in forming new chemical compounds, providing a neutral buffer between charged ions that would normally repel each other.

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 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 ...

A quantum state predicted by the Russian theoretician Vitaly Efimov 40 years ago has been discovered by physicists in a molecule consisting of three helium atoms. The molecule is of enormous ...

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 ...