Appendix A: Conventions of notations, symbols, units, acronyms
2003
A Conventions of notations, symbols, units, acronyms A.1 Units We list here basic physical constants and units (data are taken from [Sue63]): electron mass: m e c 2 = 510.9keV = 37.57×10 3 Ry = 18.78×10 3 Ha m e = 0.0156 eV fs 2 a -2 0 = 0.5 Ry -1 a -2 0 = 1 Ha -1 a -2 0 light velocity: c = 5670 a 0 fs -1 = 274.12Ry a 0 = 137.06 a 0 Ha -1 fine-structure constant: α = e 2 c = 0.007297 = 1 137.03charge: e 2 = 1 Ha a 0 = 2 Ry a 0 = 14.40 eV Å dielectric constant: 0 = 1 4π ≡ Gaussian system of units Bohr energy: E B = e 4 m e 2 2 = α 2 m e c 2 2 = 13.604eV = 1 Ry = 1 2 Ha Bohr radius: a 0 = 2 m e c 2 = 0.5291 Å = 0.05291 nm = 0.5291×10 -10 m