In physics, the fine-structure constant, also known as Sommerfeld`s constant, commonly denoted α, is a fundamental physical constant, namely the coupling constant characterizing the strength of the electromagnetic interaction between elementary charged particles. Being a dimensionless quantity, it has the same numerical value in all systems of u....
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http://en.wikipedia.org/wiki/Fine-structure_constant
(from the article `Physical Sciences`) ...interaction between electrically charged particles—and an experiment based on observations of an electron in a single-electron cyclotron to ... The amount of splitting is characterized by a dimensionless constant called the fine-structure constant. This constant is given by the equation = ...
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http://www.britannica.com/eb/a-z/f/26
The fundamental numerical constant of atomic physics and quantum electrodynamics. Denoted by a, the fine structure constant is defined as the square of the charge of the electron divided by the product of Planck's constant and the speed of light. It has the value 1/137.036.
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http://www.daviddarling.info/encyclopedia/F/fine_structure_constant.html
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