Free electron g factor.

value = gfree
[value,sigma] = gfree

gfree returns the g value of the free electron in value and the standard deviation in sigma (if two output arguments are specified).

The value and the standard deviation are taken from the 2018 CODATA collection of recommended values.

amu, angstrom, avogadro, barn, bmagn, bohrrad, boltzm, clight, echarge, emass, eps0, evolt, faraday, gammae, hartree, hbar, molgas, mu0, nmagn, nmass, planck, pmass, rydberg