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ampsci
c++ program for high-precision atomic structure calculations of single-valence systems
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Set of commonly-used Physics constants. More...
Variables | |
| constexpr double | c_SI = 299792458.0 |
| c, speed of light: 299 792 458 m/s [exact] | |
| constexpr double | h_SI = (6.62607015e-34) |
| Planck constant h: 6.626 070 15 e-34 J.s [exact]. | |
| constexpr double | hbar_SI = h_SI / (2.0 * M_PI) |
| hbar: 6.626 070 15 e-34 / (2 Pi) J.s [exact] | |
| constexpr double | e_C = 1.602176634e-19 |
| Fundamental charge, Coulombs. 1.602 176 634 e-19 C [exact]. | |
| constexpr double | alpha = 1.0 / 137.035999177 |
| Fine-structure constant: alpha = 1/137.035 999 177(21) [CODATA 2022]. | |
| constexpr double | g_e = -2.00231930436092 |
| electron g-factor: -2.002 319 304 360 92(36) [CODATA 2022] | |
| constexpr double | e_on_me_SI = 1.75882000838e11 |
| e/me: 1.758 820 008 38(55) e11 [CODATA 2022] | |
| constexpr double | m_e_kg = e_C / e_on_me_SI |
| electron mass, in SI (kg) | |
| constexpr double | m_p = 1836.152673426 |
| Proton mass, in atomic units (mp/me). CODATA 2022: 1836.152 673 426(32) | |
| constexpr double | m_muon = 206.7682827 |
| muon mass in atomic units (m_mu/m_e). Codata 2022: 206.768 2827(46) | |
| constexpr double | m_tau = 3477.23 |
| tauon mass in atomic units (m_tau/m_e) 3477.23(23) | |
| constexpr double | u_NMU_kg = 1.66053906892e-27 |
| unified atomic mass unit; (nuclear mass unit, Dalton): CODATA 2022: 1.660 539 068 92(52) x 10-27 kg | |
| constexpr double | aB_m = hbar_SI / (m_e_kg * c_SI * alpha) |
| Bohr radius, in m. : hbar/(m_e*c*alpha) | |
| constexpr double | Hartree_eV = 27.211386245981 |
| Hartree (atomic energy unit = 2Ry) in eV, 27.211 386 245 981(30) eV [CODATA 2022]. | |
| constexpr double | GF_GeV2 = 1.1663787e-5 |
| Fermi weak constant, in GeV^-2: 1.166 3787(6) x 10-5 GeV-2 [CODATA 2022]. | |
| constexpr double | alpha2 = alpha * alpha |
| constexpr double | c = 1.0 / alpha |
| speed of light in a.u. (=1/alpha) | |
| constexpr double | c2 = c * c |
| constexpr double | hbarc_MeVfm = (hbar_SI * c_SI / e_C) * 1.0e9 |
| hbar * c, in MeV.fm | |
| constexpr double | m_e_MeV = Hartree_eV * c2 / 1.0e6 |
| Electron mass (MeV/c^2) | |
| constexpr double | u_NMU = u_NMU_kg / m_e_kg |
| unified atomic mass unit; (nuclear mass unit, Dalton): au | |
| constexpr double | aB_cm = aB_m * (1.0e+2) |
| constexpr double | aB_fm = aB_m * (1.0e+15) |
| constexpr double | aB_nm = aB_m * (1.0e+9) |
| constexpr double | Hartree_Hz = Hartree_eV * e_C / h_SI |
| Hartree (atomic energy unit = 2Ry) in Hz. | |
| constexpr double | Hartree_MHz = Hartree_Hz * (1.0e-6) |
| constexpr double | Hartree_GHz = Hartree_Hz * (1.0e-9) |
| constexpr double | Hartree_invcm = 1.0 / (2.0 * M_PI * c * aB_cm) |
| Hartree to cm^-1 conversion [wave-number, inverse cm]: | |
| constexpr double | HartreeWL_nm = 2.0 * M_PI * c * aB_m * (1.0e+9) |
| Hartree to corresponding wavelength, in nm. | |
| constexpr double | hbar_on_EH = hbar_SI / e_C / Hartree_eV |
| hbar/E_H (atomic unit of time) (in seconds) | |
| constexpr double | muB_SI = 0.5 |
| Bohr magneton (in SI-derived atomic units): | |
| constexpr double | muB_CGS = 0.5 * alpha |
| Bohr magneton (in Gaussian CGS-derived atomic units): | |
| constexpr double | muN_SI = muB_SI / m_p |
| Nulcear magneton (in SI-derived atomic units): | |
| constexpr double | muN_CGS = muB_CGS / m_p |
| Nulcear magneton (in Gaussian CGS-derived atomic units): | |
| constexpr double | muN_CGS_MHz = Hartree_MHz * muB_CGS / m_p |
| Nulcear magneton in MHz (via Gaussian CGS-derived atomic units): | |
| constexpr double | barn_m2 = 1.0e-28 |
| barn = 1.0e-28m^2, for Quadrupole moment | |
| constexpr double | barn_au = barn_m2 / (aB_m * aB_m) |
| constexpr double | barn_MHz = barn_au * Hartree_MHz |
| constexpr double | GF = GF_GeV2 * alpha * m_e_MeV * m_e_MeV * 1e-6 |
| Fermi weak constant (au). | |
| constexpr double | GFe11 = GF * 1.0e11 |
| Fermi weak constant * 10^11, in atomic units. | |
Set of commonly-used Physics constants.
Constains physical constants, and units conversions. Taken mostly from 2018 CODATA values. https://physics.nist.gov/cuu/Constants/
1.9.8