THE Bohr theory showed its inadequacy most when the above question was asked. After describing the motion of an electron with minutest detail in all of its many orbits, a deafening silence answered ...

Attosecond lasers provide the shortest light pulses yet, allowing observation of nature's most short-lived events. Researchers have used these lasers for the first time to take snapshots of electrons ...

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Speed matters. When an X-ray photon excites an atom or ion, making a core electron jump onto a higher energy level, a short-lived window of opportunity opens. For just a few femtoseconds, before an ...

A research collaboration can read out optically previously indistinguishable spin states by using a newly developed spectroscopy method. The alternation between singlet and triplet states of electron ...

The entire semiconductor industry, not to mention Silicon Valley, is built on the propensity of electrons in silicon to get kicked out of their atomic shells and become free. These mobile electrons ...

The alternation between singlet and triplet states of electron pairs in charge-separated states plays an important role in nature. Presumably, even the compass of migratory birds can be explained by ...