1(a.u.) = 1.05457168(18)×10?34J?s(角动量)= 9.1093826(16)×10?31kg = 5.4857990945(24)×10?4amu(质量)= 2187691.2633(72)m/s = c(速度)(α为精细结构常数)= 1.99285166(34)×10?24kg?m/s(动量)= 1 Bohr = 5.291...