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A basic Bohr model (1913) of a photon, as a "quanta" of light emitted from an electron, when going down orbital, or absorbed into an electron, when going up orbital.

In particle physics, photon (TR:188) (LH:4) (TL:192), symbol: Gamma.png (gamma), refers to []


The following is an Bohr model (1913) of an atom showing a photon absorbing into an electron, causing it to go up ↑ in orbital position, and photon emitting from an electron causing it to go down ↓ in orbital position:

Bohr model (gif).gif


The term “photon” was first employed by: Leonard Troland (1917), intermixed with “light element” (Compton, 1923), and again photon (Millikan, 1924), citing Compton. The solidified coining, however, was done by Lewis, who defined it as a light particle:

“I therefore take the liberty of proposing for this hypothetical new atom, which is not light but plays an essential part in every process of radiation, the name photon.
Gilbert Lewis (1926), “The Conservation of Photons” (pg. #)


The following are quotes:

Light — an electromagnetic field of certain wavelength range — is a stream of photons; those of light are on the mass shell, those of electric and magnetic fields are not.”
— Martinus Veltman (2003), Facts and Mysteries in Elementary Particle Physics [1]

End matter


  1. Veltman, Martinus. (2003). Facts and Mysteries in Elementary Particle Physics (pg. 17). World Scientific.

External links

Theta Delta ics T2.jpg