The negative @E01923@ which appears on the electron or univalent ions [ \(1.602\times 10^{-19}\) coulombs or \(4.803\times 10^{-10}\) electrostatic units (\(\mathrm{esu}\))].
Source: PAC, 1990,
62, 2167. (
Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2186 [
Terms] [
Paper]