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Bohr radius
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== Related constants == The Bohr radius is one of a trio of related units of length, the other two being the [[Compton wavelength]] of the electron ({{tmath| \lambda_{\mathrm{e} } }}) and the [[classical electron radius]] ({{tmath| r_{\mathrm{e} } }}). Any one of these constants can be written in terms of any of the others using the fine-structure constant {{tmath| \alpha }}: : <math>r_{\mathrm{e}} = \alpha \frac{\lambda_{\mathrm{e}}}{2\pi} = \alpha^2 a_0.</math>
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