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Additional
fine-structure constant
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Fine-structure constant
In
physics
, the
fine-structure constant
, also known as
Sommerfeld's constant
, commonly denoted
a
(the
Greek letter alpha
), is a
fundamental physical constant
characterizing the strength of the
electromagnetic interaction
between elementary charged particles. It is related to the
elementary charge
(the electromagnetic
coupling constant
)
e
, which characterizes the strength of the coupling of an elementary charged particle with the
electromagnetic field
, by the formula . Being a
dimensionless quantity
, it has the same numerical value in all
systems of units
.
Arnold Sommerfeld
introduced the fine-structure constant in 1916.
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