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

Physical Constants



speed of light in atomic units


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


– –

atomic mass from a.u. to kilograms

\(1.660539040 \times 10^{-27}\)

a.u. to kilograms