Series spectra of chlorine.—Twenty-six lines are classified in ${\mathrm{Cl}}_{\mathrm{II}}$, eighty-eight in ${\mathrm{Cl}}_{\mathrm{III}}$, twenty-six in ${\mathrm{Cl}}_{\mathrm{IV}}$ and seventeen in ${\mathrm{Cl}}_{\mathrm{V}}$. Twenty-one term values are fixed in ${\mathrm{Cl}}_{\mathrm{III}}$.

Series spectra of ${\mathrm{Si}}_{\mathrm{II}}$, ${\mathrm{P}}_{\mathrm{III}}$ and ${\mathrm{S}}_{\mathrm{IV}}$.—Five lines are identified in ${\mathrm{Si}}_{\mathrm{II}}$ in addition to those previously known. Fifteen additional lines are classified in ${\mathrm{P}}_{\mathrm{III}}$ and thirteen in ${\mathrm{S}}_{\mathrm{IV}}$.

• Received 31 October 1927

DOI:https://doi.org/10.1103/PhysRev.31.34