The May 2019 values of the field emission universal constants, and related matters

Theories of electron and ion emission use various special universal constants defined as particular combinations of well-known fundamental constants. Following the May 2019 changes in the international system of measurement, this paper presents refreshed tabulations of: (a) the relevant fundamental constants, in both SI units and field emission customary units; and (b) universal constants used in field electron emission contexts, expressed in field emission customary units.