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=== Quantization of matter ===
{{main | Matter wave | Schodinger Equation }}
In 1922 [[Otto Stern]] and [[Walther Gerlach]] [[Stern-Gerlach experiment |demonstrated]] that the magnetic properties of silver atoms do not take a continuous range of values: the magnetic values are quantized and limited to only two possibilities.<ref name="cigar">{{Cite journal |last=Friedrich |first=Bretislav |last2=Herschbach |first2=Dudley |date=December 2003 |title=Stern and Gerlach: How a Bad Cigar Helped Reorient Atomic Physics |url=http://physicstoday.scitation.org/doi/10.1063/1.1650229 |journal=Physics Today |language=en |volume=56 |issue=12 |pages=53–59 |doi=10.1063/1.1650229 |issn=0031-9228}}</ref> Unlike the other then known quantum effects, this striking result involves the state of a single atom.<ref name=Whittaker/>{{rp|v2:130}}
In 1924 [[Louis de Broglie]] proposed that electrons in an atom are constrained not in "orbits" but as standing waves. In detail his solution did not work, but his hypothesis – that the electron "corpuscle" moves in the atom as a wave – spurred [[Edwin Schrodinger]] to develop a [[Schrodinger equation | wave equation]] for electrons; when applied to Hydrogen the Rydberg formula was accurately reproduced. In 1928 [[Paul Dirac]] published his [[Dirac equation | relativistic wave equation]] simultaneously incorporating [[Theory of relativity| relativity]], predicting [[anti-matter]], and providing a complete theory for the Stern-Gerlach result. These successes launched a new fundamental understanding of our world: quantum mechanics.
Planck and Einstein started the revolution with quanta that broke down the continuous models of matter and light. Twenty years later "corpuscles" like electrons came to be modeled as continuous waves. This result came to be called wave-particle duality, one iconic idea along with the uncertainty principle that sets quantum mechanics apart from older models of physics.
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