## fine structure constant, $$\alpha$$

https://doi.org/10.1351/goldbook.F02389
Atomic fundamental physical constant, $$\alpha =\frac{\mu _{0}\ e^{2}\ c_{0}}{2\ h} = 7.297\ 353\ 08\ \left(33\right)\times 10^{-3}$$, where $$\mu _{0}$$ is the @P04504@, $$e$$ the @E02032@, $$h$$ the @P04685@, and $$c_{0}$$ the speed of light.
Source:
CODATA Bull. 1986, 63, 1 [Terms] [Book]