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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 | alpha = 1.0 / 137.035999084 |
| fine-structure constant | |
| 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 | c_SI = 299792458.0 |
| speed of light, in m/s [CODATA 2018, exact] | |
| constexpr double | hbar_SI = (6.62607015e-34) / (2.0 * M_PI) |
| hbar (reduced Planck constant), in SI (J.s) | |
| constexpr double | e_C = 1.602176634e-19 |
| Fundamental charge, Coulombs. 1.602176634 x 10-19 [exact]. | |
| constexpr double | hbarc_MeVfm = (hbar_SI * c_SI / e_C) * 1.0e9 |
| CODATA 2018: hbar*c = 197.326 980 4... MeV fm. | |
| constexpr double | m_p = 1836.15267343 |
| Proton mass, in atomic units (mp/me). CODATA 2018: 1836.152 673 43(11) | |
| constexpr double | m_e_kg = 9.1093837015e-31 |
| electron mass, in SI (kg). CODATA 2018: m_e = 9.109 383 7015(28) e-31 | |
| constexpr double | m_e_MeV = 0.51099895000 |
| Electron mass (MeV/c^2); 2020 value 0.51099895000(15): | |
| constexpr double | m_e_GeV = m_e_MeV / 1000.0 |
| constexpr double | u_NMU = 1822.888486192 |
| unified atomic mass unit; (nuclear mass unit, Dalton). CODATA 2014: 1822.888 486 192(53) | |
| constexpr double | aB_m = 0.529177210903e-10 |
| Bohr radius, in m. CODATA 2018: a_B = 0.529177210903(80)e-10 m. | |
| 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 | hbar_on_EH = 2.4188843265857e-17 |
| hbar/E_H. wiki: 2.4188843265857(47)*10-17 s [wiki 2019] | |
| constexpr double | time_s = hbar_on_EH |
| Atomic unit of time (in seconds) - hbar/E_H. | |
| constexpr double | Hartree_eV = 27.211386245988 |
| Hartree (atomic energy unit = 2Ry) in eV. CODATA 2018: E_H = 27.211 386 245 988(53) eV. | |
| constexpr double | Hartree_Hz = 6.579683920502e+15 |
| 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) |
| constexpr double | HartreeWL_nm = 2.0 * M_PI * c * aB_m * (1.0e+9) |
| constexpr double | GFe11 = 2.222516e-3 |
| Fermi weak constant (au). Times 10^{11}. More... | |
| constexpr double | GF = GFe11 * (1.0e-11) |
| constexpr double | g_e = -2.00231930436256 |
| electron g-factor. CODATA 2018: -2.002 319 304 362 56(35) | |
| 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 |
Set of commonly-used Physics constants.
Constains physical constants, and units conversions. Taken mostly from 2018 CODATA values. https://physics.nist.gov/cuu/Constants/
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constexpr |
Fermi weak constant (au). Times 10^{11}.
Particle Data Group 2020: Gf = 1.1663787(6) e-5 (hbar*c)^3 GeV^-2 = 1.1663787(6) e-5 alpha (GeV/c^2)^-2 au me = 0.51099895000 e-3 GeV/c^2 = 1 au Gf = 2.222516(11) e-3 au
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