Here is a table of the fundamental physical constants used in BAGEL. They are taken from CODATA 2014.

Physical Constants   Value Unit
speed of light in atomic units   \(137.035999139\) atomic units
speed of light in SI units   \(2.99792458 \times 10^8\) SI units
mass of electron from a.u. to kilograms   \(9.10938356 \times 10^{-31}\) a.u. to kilograms
elementary charge from a.u. to coulomb   \(1.6021766208 \times 10^{-19}\) a.u. to coulomb
Bohr radius from a.u. to meter   \(5.2917721067 \times 10^{-11}\) a.u. to meter
Avogadro constant   \(6.022140857 \times 10^{23}\) mol \(^{-1}\)
electron g factor   \(2.0023193043618\) – –
atomic mass from a.u. to kilograms   \(1.660539040 \times 10^{-27}\) a.u. to kilograms