Terms Arising from Similar and Dissimilar Electrons

Following the scheme of ${\mathrm{Hund}}^1$ for similar $s$, $p$ and $d$ electrons the terms arising from similar $f$ electrons have been worked out and tabulated. Tables have also been prepared for one and two electrons, where in the latter case these electrons are dissimilar i.e. have either different total or different azimuthal quantum numbers, and also for three electrons two of which are similar. These tables along with those for similar $s$, $p$ and $d$ electrons are found not only to be of frequent use but also to bring out certain rules that may be applied in determining spectral terms arising from any electron configuration.