% Atomic units [a.u.] -> [SI] 

au.L = 5.29177210903 * 1e-11;         % Length in [m]
au.T = 2.4188843265857 * 1e-17;       % Time in [s]
au.V = 2.18769126364 * 1e6;           % Velocity in [m/s]
au.C = 1.602176634 * 1e-19;           % Charge in [C]
au.A = 1.054571817 * 1e-34;           % Action in [Js]
au.E = 4.359744722207185 * 1e-18;     % Energy in [J]
au.Ee = 27.211386245988;              % Energy in [eV]
au.M = 9.1093837015 * 1e-31;          % Mass in [kg]
au.F = 5.14220826 * 1e11;             % Electric Field Strength in [V/m]
au.I = 6.436409900673126 * 1e15;      % Intensity of field in [W/cm^2]
au.eps = 1.11265005545 * 1e-10;       % Permittivity in [F/m]

% physical constants in atomic units
au.e = 1;                             % elementary charge
au.hbar = 1;                          % reduced Planck constant
au.m_e = 1;                           % electron mass
au.epsilon_0 = 1/(4*pi);              % permittivity
au.c = 299792458 / au.V;              % speed of light in vacuum