coulomb radius

https://doi.org/10.1351/goldbook.08787
Distance between two oppositely charged charge carriers at which the energy of their Coulombic attraction is equal to kT, where k is the Boltzmann constant and T the absolute temperature.
Source:
PAC, 2022, 94, 15. (Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)) on page 22 [Terms] [Paper]