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We recently performed experiments on the transfer of photon spin to electronorbital angular momentum. For an interpretation of the experimental results weused a classical electrodynamic model of the photon as a propagatingelectromagnetic solitary wave which is developed in detail here. A linearlypolarized monochromatic photon is considered as a propagating solitaryelectromagnetic wave of finite energy hf which carries an angular momentumh/2pi with the frequency f and Plancks constant h. This model has, apart frombeing a tool for an interpretation of our experimental results, far reachingconsequences of fundamental relevance and guides us to an outline to a unifiedquantum theory of electromagnetism and gravitation including an explanation ofthe electrodynamic origin of the quantized charge of an electron.

On Photon Spin and the Electrodynamic Origin of the charge of the Electron