Scientists at the X-ray free-electron laser SwissFEL have realized a long-pursued experimental goal in physics: to show how ...

Rydberg molecules and atoms comprise a captivating branch of modern quantum chemistry and atomic physics, where atoms in highly excited electronic states interact to form unusually long-range ...

When a molecule absorbs light, it undergoes a whirlwind of quantum-mechanical transformations. Electrons jump between energy levels, atoms vibrate, and chemical bonds shift—all within millionths of a ...