Constant

Expression

Value [cgs]

spin angular momentum

$S=\sqrt{s\left(s+1\right)}\frac{h}{2\pi }$ , $s=\frac{1}{2}$

9.132859842 × 10⁻²⁸

projection of S on Larmor precession axis

$S_Z=s\frac{h}{2\pi }$ [6]

5.272859088 × 10⁻²⁸

charge

$q=-\sqrt{\alpha \left(\frac{h}{2\pi }\right)c}$

−4.803204713 × 10⁻¹⁰

g-factor

$g_e=2\left(1+{\displaystyle \sum _{i=1}^{\infty }{C}_i}\left(\frac{\alpha }{\pi }\right)\right)$

2.002319304

magnetic dipole moment

$M=-\sqrt{\alpha \frac{h^3}{2^7{\pi }^3{m}^{2}c}}{g}_e$

−9.284764698 × 10⁻²¹

(−9.2847647043 × 10⁻²¹ [15] )

classical electron radius

$R=\frac{q^2}{m{c}^2}$

2.817940325 × 10⁻¹³

(2.8179403262 × 10⁻¹³ [16] )

shape eccentricity

$\frac{R}{r}=\sqrt{\frac{2M\alpha }{qR}}$

1.000579658

$\frac{\text{outershellcharge}}{\text{electroncharge}}=\frac{\text{outershellmass}}{\text{electronmass}}$

$\frac{q^{-}}{q}=\frac{m^{+}}{m}=\frac{3}{2\alpha }$

205.5539986

$\frac{\text{centralcorecharge}}{\text{electroncharge}}=\frac{\text{centralcoremass}}{\text{electronmass}}$

$\frac{q^{+}}{q}=\frac{m^{-}}{m}=1-\frac{3}{2\alpha }$

−204.5539986