Constants

class Constants

Constants subset of physical constants and unit helpers.

Values are SI by default and accessible via SI(). For convenience, Micro() loads a scaled set for micron–microsecond–kilogram contexts. All values are scalars in base SI unless otherwise stated.

Example:

hbar = Constants.SI("hbar");
Constants.SI();    % load named constants into caller
Constants.Micro(); % load scaled constants into caller

Property Summary

BohrMagneton = 9.27400915e-24

\(\mu_B\) [J/T].

BohrRadius = 0.52917720859e-10

\(a_0\) [m].

BoltzmannConstant = 1.3806504e-23

\(k_B\) [J/K].

ElectronGFactor = 2.0023193043622

\(g_S\).

ElectronMass = 9.10938215e-31

\(m_e\) [kg].

ElectronSpin = 0.5

\(S_e\).

ElementaryCharge = 1.602176487e-19

\(e\) [C].

ReducedPlanckConstant = 1.054571628e-34

\(\hbar\) [J·s].

SpeedOfLight = 2.99792458e8

c [m/s].

VacuumImpedance = 1/Constants.VacuumPermittivity/Constants.SpeedOfLight

\(Z_0\) [Ohm].

VacuumPermeability = 4*pi*1e-7

\(\mu_0\) [H/m].

VacuumPermittivity = 8.854187817e-12

\(\epsilon_0\) [F/m].

Method Summary

static Micro(constantName)

Load constants in micron–microsecond–kilogram units into caller.

Parameters:

constantName (string, optional) – If provided, return the named constant value instead

Returns:

Constant value when constantName is provided

Return type:

double, optional

static SI(constantName)

Load constants in SI units into the caller workspace.

Parameters:

constantName (string, optional) – If provided, return the named constant value instead

Returns:

Constant value when constantName is provided

Return type:

double, optional