1928 – Dirac equation

Based on the previous Schrodinger equation and Klein-Gordon equation, in 1928 Paul Dirac produced a wave equation that helped to explain the characteristic of an electron known as “spin”. In part, it dealt with an expansion of Einstein’s famous equation of “e=mc^2” that allowed a consideration of two sets of roots, one positive and one negative. Eventually, this led to a theory of antimatter (the positron) which was confirmed by experiment in 1932.

Timeline of the Atom
1902 – Dirac

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