| constant | symbol | value [cgs] |
| fine structure constant | α | 7.2973525693 × 10−3 [2] |
| Planck’s constant | h | 6.62607015 × 10−27 [3] |
| speed of light | c | 2.99792458 × 1010 [4] |
| electron mass | m | 9.1093837015 × 10−28 [5] |