N
a constant used in quantum mechanics, equal to the Planck constant divided by 2π. It has a value of 1.054571596±0.000000078 × 10–34 joule seconds 狄拉克常量 ( symbol: , symbol: Also called crossed-h, h-bar)
The relation betweenscreeningconstantandtemperaturehas been obtained by the approximateeigenfunctionsofelectrons in a crystal and Fermi-Diracstatistics.