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Fine-structure constant

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Numbers

$\alpha$:

0.0072973525675 +/- 1.09e-11

$\alpha^{-1}$:

137.035999113 +/- 2.03e-7

Definition

The fine-structure constant $\alpha$ is the dimensionless physical constant defined as $\alpha = e^2/(2 \varepsilon_0 c h)$, where $e$ is the elementary charge, $\varepsilon_0$ the electric constant, $c$ the speed of light in vacuum, and $h$ the Planck constant.

Comments

(1)

$\alpha$ may not be constant [3].

References

[1]

Arnold Sommerfeld, "Zur Quantentheorie der Spektrallinien", Annalen der Physik Ser. 4, Bd. 51 (1916).

Links

Data properties