| \(h\) |
Planck constant |
\(6.626\,070\,15 \times 10^{-34}\,\mathrm{J\cdot s}\) (exact) |
| \(\hbar = h/(2\pi)\) |
Reduced Planck constant |
\(1.054\,571\,817\ldots \times 10^{-34}\,\mathrm{J\cdot s}\) (exact) |
| \(e\mathrm{V}\) |
Electronvolt |
\(1.602\,176\,634 \times 10^{-19}\,\mathrm{J}\) (exact) |
| \(hc\) |
Planck energy–length product |
\(1.239\,841\,984\ldots \times 10^{-6}\,\mathrm{eV\cdot m}\) |
| \(\hbar c\) |
Reduced Planck energy–length product |
\(197.326\,980\,4\ldots\,\mathrm{MeV\cdot fm}\) |
| \(R_{\infty}\) |
Rydberg constant |
\(1.097\,373\,156\,8160(21) \times 10^{7}\,\mathrm{m^{-1}}\) |
| \(hcR_{\infty}\) |
Rydberg energy |
\(13.605\,693\,122\,994(26)\,\mathrm{eV}\) |
| \(E_{\mathrm{h}}\) |
Hartree energy |
\(27.211\,386\,245\,988(53)\,\mathrm{eV}\) |
| \(E_1 = -hcR_{\infty}\) |
Hydrogen ground-state energy |
\(-13.605\,693\,122\,994(26)\,\mathrm{eV}\) |
| \(\alpha\) |
Fine-structure constant |
\(7.297\,352\,5693(11) \times 10^{-3}\) |
| \(a_0\) |
Bohr radius |
\(5.291\,772\,109\,03(80) \times 10^{-11}\,\mathrm{m}\) |
| \(m_{\mathrm{e}}\) |
Electron mass |
\(9.109\,383\,7015(28) \times 10^{-31}\,\mathrm{kg}\) |
| \(m_{\mathrm{p}}\) |
Proton mass |
\(1.672\,621\,923\,69(51) \times 10^{-27}\,\mathrm{kg}\) |