Polarization measurements of the $2s$--$2p_{3/2}$ VUV transition in N$^{4+}$ excited by electron collisions

We present the linear polarization of the $2s$--$2p_{3/2}$ transition in Li-like N$^{4+}$ excited by electron collisions, measured at electron energies between 85 and 1000~eV. The measured polarizations are compared with theoretical values calculated using the Flexible Atomic Code (FAC). Although th