| Planck constant h | 6.6260755e-34 J s | h/(2 pi) = 1.05457266e-34 J s | . |
| Boltzmann constant k_B | 1.380658e-23 J/K | . | |
| Elementary charge e | 1.60217733e-19 C | . | |
| Avogadro number N_A | 6.0221367e23 particles/mol | ||
| Speed of light c | 2.99792458e8 m/s | ||
| Permeability of vacuum mu_0 | mu_0 = 4 pi e-7 T2 m3/J | 12.566370614e-7 T2 m3/J | |
| Permittivity of vacuum epsilon_0 | epsilon_0 = 1/(mu_0 c^2) | 8.854187817e-12 C2/J m | |
| Fine structure constant 1/alpha | 137.0359895 | ||
| Electron rest mass m_e | 9.1093897e-31 kg | ||
| Proton rest mass m_p | 1.6726231e-27 kg | ||
| Neutron rest mass m_n | 1.6749286e-27 kg | ||
| Bohr magneton mu_B | mu_B = eh/(4 pi m_e) | 9.2740154e-24 J/T | |
| Nuclear magneton mu_N | mu_N = eh/(4 pi m_p) | 5.0507866e-27 J/T | |
| Free electron g factor g_e | 2.002319304386 | ||
| Free electron gyromagnetic ratio gamma_e | gamma_e = 2 pi g_e mu_B / h | 1.7608592e11 1/s T | gamma_e/(2 pi) = 28.024944 GHz/T |
| Electron magnetic moment mu_e | mu_e = -(1/2) g_e mu_B | -9.2847701e-24 J/T | |
| Proton gyromagnetic ratio (H2O) gamma_p | 2.67515255e8 1/s T | gamma_p/(2 pi) = 42.576375 MHz/T | |
| Proton magnetic moment mu_p | 1.41060761e-26 J/T | ||
| Proton-electron ratios | m_p/m_e = 1836.152701 | mu_e/mu_p = 658.2106881 | gamma_e/gamma_p = 658.2275841 (protons in water) |
| Charge-to-mass ratio for electron e / m_e | 1.75880e11 C/kg | |
| Atomic mass unit | 1.66057e-27 kg | |
| Bohr radius a_0 | 5.29177e-11 m | |
| Electron radius r_e | 2.81792e-15 m | |
| Gas constant R | R = N_A k_B | 8.3143 m2 kg/s2 K mol |
| Molar volume V_mol | 22.41383 m3/kmol | |
| Faraday constant F | F = N_A e | 9.64846e4 C/mol |
| Proton g factor (Lande factor) g_H | 5.585 | |
| Gravitational constant G | 6.6732e-11 m3/kg s2 | |
| Acceleration due to gravity g | 9.80665 m/s2 | |
| Compton wavelength of the electron lambda_c | lambda_c = h / (m_e c) | 2.42631e-12 m |
| Atomic energy unit Hartree | 1 Hartree = e^2 /(4 pi epsilon_0 a_0) |
| 1 Hartree = 2.625501e+06 J/mol (approx. 627.5 kcal/mol) |
| Proton Larmor frequency | nu_p = gamma_p/(2 pi) B | nu_p = 42.5764 MHz/T (H2O) |
| Electron Larmor frequency | nu_e = gamma_e/(2 pi) g/g_e B | nu_e [GHz] = 13.9962 g B[T] |
| g = 0.07144775 nu_e[GHz]/B[T] | g = 3.04199 nu_e[GHz]/nu_p[MHz] | |
| B [T] = 0.0234872 nu_p[MHz] | ||
| Conversion of Units | 1 G = 0.1 mT | 1 T = 10 kG |
| 1 mT = 10 G | A[MHz] = 2.80249 (g/g_e) A[G] | |
| A[MHz] = 28.0249 (g/g_e) A[mT] | A[MHz] = 13.9962 g A[mT] | |
| A[MHz] = 2.99792e4 A[1/cm] | A[1/cm] = 0.333564e-4 A[MHz] | |
| A[1/cm] = 4.66863e-4 g A[mT] |
Eddy Lingeman, January 1996, ed@nikhef.nl