Ionizing Potentials and Far Ultra-Violet Lines of Light Atoms

By an interpolation the ionizing potentials of F and F⁺ are found to be 17.4 and 34.5 volts. These new values improve the regularity of the relationships of the values of (νR)1/2 corresponding to the ionizing potentials of the atoms of the first short period. The energy necessary for the removal of a $2s$ electron from each of many of the atoms and ions of these elements (L₁₁ levels for an atom) is calculated by use of the s²p^n-1-spⁿ lines.The effect of the removal of a $2s$ electron upon the subsequent removal of a $2p$ electron is found for B, F, and Ne to be an increase of (νR)1/2 by about 0.45. This is used to get a prediction of the wave-lengths of missing s²p^n-1-spⁿ lines of C, N, N⁺, and O.New identifications of the far ultra-violet lines of Mg are proposed and the third ionizing potential found to be 80.4±{}1 volts. A pair of lines of F are tentatively identified as the 2s²2p⁵²P-2s2p⁶²S lines.