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Celeritas 0.6.0-dev.116+3fbab5e0
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Celeritas 0.6.0-dev.116+3fbab5e0
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Mathematical, numerical, and physical constants. More...
Variables | |
| constexpr Constant | e_electron {1} |
| Special case for CLHEP: electron charged is unity by definition. | |
Physical constants with exact value as defined by SI | |
| constexpr Constant | c_light = Constant{299792458.} * units::meter / units::second |
| constexpr Constant | h_planck = Constant{6.62607015e-34} * units::joule * units::second |
| constexpr Constant | k_boltzmann = Constant{1.380649e-23} * units::joule / units::kelvin |
| constexpr Constant | na_avogadro {6.02214076e23} |
| constexpr Constant | kcd_luminous {683} |
Exact derivative constants | |
| constexpr Constant | hbar_planck {h_planck / (2 * pi)} |
Experimental physical constants from CODATA 2018 | |
| constexpr Constant | a0_bohr = Constant{5.29177210903e-11} * units::meter |
| constexpr Constant | alpha_fine_structure = Constant{7.2973525693e-3} |
| constexpr Constant | atomic_mass = Constant{1.66053906660e-24} * units::gram |
| constexpr Constant | electron_mass = Constant{9.1093837015e-28} * units::gram |
| constexpr Constant | proton_mass = Constant{1.67262192369e-24} * units::gram |
| constexpr Constant | eps_electric |
| constexpr Constant | mu_magnetic |
| constexpr Constant | r_electron = Constant{2.8179403262e-15} * units::meter |
| constexpr Constant | rinf_rydberg = Constant{10973731.568160} / units::meter |
| constexpr Constant | eh_hartree = Constant{4.3597447222071e-18} / units::meter |
| constexpr Constant | lambdabar_electron = Constant{3.8615926796e-13} * units::meter |
Other constants | |
| constexpr int | stable_decay_constant {0} |
Mathemetical constants (truncated) | |
| constexpr Constant | pi {3.14159265358979323846} |
| constexpr Constant | sqrt_pi {1.77245385090551602730} |
| constexpr Constant | euler {2.71828182845904523536} |
| constexpr Constant | sqrt_euler {1.64872127070012814685} |
| constexpr Constant | sqrt_two {1.41421356237309504880} |
| constexpr Constant | sqrt_three {1.73205080756887729353} |
Mathematical, numerical, and physical constants.
Some of the physical constants listed here are exact numerical values: see si-2019 for definition of constants and how they relate to the different units.
| Celeritas | CLHEP | Notes |
|---|---|---|
| a0_bohr | Bohr_radius | Bohr radius |
| alpha_fine_structure | fine_structure_const | |
| atomic_mass | amu | Not the same as 1/avogadro |
| eps_electric | epsilon0 | Vacuum permittivity |
| h_planck | h_Planck | |
| k_boltzmann | k_Boltzmann | |
| mu_magnetic | mu0 | Vacuum permeability |
| na_avogadro | Avogadro | [1/mol] |
| r_electron | classic_electr_radius | Classical electron radius |
| kcd_luminous | [none] | Lumens per Watt |
| lambdabar_electron | electron_Compton_length | Reduced Compton wavelength |
| stable_decay_constant | [none] | Decay for a stable particle |
In the CLHEP unit system, the value of the constant e_electron is defined to be 1 and coulomb is derivative from that. To avoid floating point arithmetic issues that would lead to the "units" and "constants" having different values for it, a special case redefines the value for CLHEP.
Some experimental physical constants are derived from the other physical constants, but for consistency and clarity they are presented numerically with the units provided in the CODATA 2018 dataset. The Constants.test.cc unit tests compare the numerical value against the derivative values inside the celeritas unit system. All experimental values include the final (ususally two) imprecise digits; their precision is usually on the order of \( 10^{-11} \).
1.9.8