Spectrum of trebly ionized xenon (Xe IV).

The spectrum of ${\mathrm{Xe}}^{3+}$ has been observed in the 570\char21{}6900-A\r{} range. The previous analysis has been revised and extended. All levels of the ground configuration (5${s}^{2}$5${p}^{3}$) and of the 5s5${p}^{4}$ configuration are now established.