The Low Terms in Cr III, Cr IV, Mn IV and Fe V

Most of the strong lines arising from the $d^3$, $d^{2}4s$ and $d^{2}4p$ configurations of Cr IV and the $d^4$, $d^{3}4s$ and $d^{3}4p$ configurations of Cr III, Mn IV and Fe V have been classified. The presence of forbidden lines of these ions in astronomical sources is discussed.