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physics.hist-ph2007
Pascual Jordan's resolution of the conundrum of the wave-particle duality of light
Anthony Duncan, Michel Janssen
In 1909, Einstein derived a formula for the mean square energy fluctuation in black-body radiation. This formula is the sum of a wave term and a particle term. In a key contributio…
physics.hist-ph2006
On the verge of Umdeutung in Minnesota: Van Vleck and the correspondence principle (Part Two)
Anthony Duncan, Michel Janssen
This is the second installment of a two-part paper on developments in quantum dispersion theory leading up to Heisenberg's "Umdeutung" paper. In telling this story, we have taken a…
physics.hist-ph2006
On the verge of Umdeutung in Minnesota: Van Vleck and the correspondence principle (Part One)
Anthony Duncan, Michel Janssen
In October 1924, the Physical Review, a relatively minor journal at the time, published a remarkable two-part paper by John H. Van Vleck, working in virtual isolation at the Univer…