![]() ![]() ![]() Feeling ridiculed, Kronig dropped the idea. Abraham Pais noted in his book George Uhlenbeck and the Discovery of Electron Spin that Ralph Kronig finishing his PhD at Columbia University in 1925 and travelling through Europe, introduced the idea to Heisenberg and Pauli, who dryly commented that “it is indeed very clever but of course has nothing to do with reality”. The idea of spin was met with plenty of scepticism. ![]() The results also paved the way to the introduction of the concept of spin, an intrinsic angular momentum, as an inherent property of subatomic particles. ![]() It was a clear victory of quantum theory over the still widely used classical picture of the atom. One hundred years ago, Otto Stern and Walther Gerlach performed their ground-breaking experiment shooting silver atoms through an inhomogeneous magnetic field, separating them according to their spatially quantised angular momentum. The HERMES experiment – A Personal Story, b y Richard Milner and Erhard Steffens, World Scientific Spin messenger The former HERMES detector at DESY’s HERA collider collected data from the scattering of longitudinally polarised electrons on various polarised and unpolarised gas targets. ![]()
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