The Second Spark Spectrum of Antimony and a Note on the First Spark Spectrum of Tin

Some sixty lines of the vacuum spark spectrum of antimony have been classified as transitions between the following terms of Sb III: $\left(s^{2}5p\right){}_{}{}^2{}_{}{}^{}P$, $\left(s^{2}6p\right){}_{}{}^2{}_{}{}^{}P$, $\left(s^{2}6s\right){}_{}{}^2{}_{}{}^{}S$, $\left(s^{2}7s\right){}_{}{}^2{}_{}{}^{}S$, $\left(s^{2}8s\right){}_{}{}^2{}_{}{}^{}S$, $\left(s^{2}5d\right){}_{}{}^2{}_{}{}^{}D$, $\left(s^{2}6d\right){}_{}{}^2{}_{}{}^{}D$, $\left(s^{2}4f\right){}_{}{}^2{}_{}{}^{}F$, $\left(s^{2}5f\right){}_{}{}^2{}_{}{}^{}F$, $\left(s^{2}5g\right){}_{}{}^2{}_{}{}^{}G$, $\left(s^{2}6g\right){}_{}{}^2{}_{}{}^{}G$, $\left(s5\mathrm{}{p}^2\right){}_{}{}^4{}_{}{}^{}P$, ${}_{}{}^2{}_{}{}^{}D$, ${}_{}{}^2{}_{}{}^{}S$, ${}_{}{}^2{}_{}{}^{}P$ and $\left(5\mathrm{}{p}^3\right){}_{}{}^4{}_{}{}^{}S$. Corresponding to the deepest term value an ionization potential of approximately 24.7 volts is calculated. A note on SN II gives the terms ${}_{}{}^4{}_{}{}^{}P$ and ${}_{}{}^2{}_{}{}^{}S$ from the ($\left(s5\mathrm{}{p}^2\right)$) configuration and new value for the terms: $\left(s^{2}7s\right){}_{}{}^2{}_{}{}^{}S$, $\left(s^{2}8s\right){}_{}{}^2{}_{}{}^{}S$, $\left(s^{2}7d\right){}_{}{}^2{}_{}{}^{}D$ and $\left(s^{2}6f\right){}_{}{}^2{}_{}{}^{}F$.