https://doi.org/10.1351/goldbook.D01533
Non-SI unit of @[email protected] It is equal to the @[email protected] for two charges of \(10^{-10}\ \text{franklin}\) separated by \(1\ \text{ångström}\), \(\text{D}=10^{-18}\ \text{Fr}\ \text{cm}\approx 3.335 \,64\times 10^{-30}\ \text{C}\ \text{m}\).
Source:
Green Book, 2nd ed., p. 115 [Terms] [Book]