Charging energy
= Charging energy
{title2=$E_C=e^2/(2C_\Sigma)$}
The electrostatic scale for placing one elementary charge on a <capacitance> $C_\Sigma$, conventionally $E_C=e^2/(2C_\Sigma)$. The discrete second difference of the quadratic island energy is $e^2/C_\Sigma=2E_C$, which is the charging contribution to successive-electron addition energies. State the convention when comparing numerical values.