Intensity ratio between Lyman-a 1 and -a 2 lines of hydrogenlike titanium observed in an electron-beam ion trap

Lyman-a lines of hydrogenlike Ti have been observed with an electron-beam ion trap. The intensity ratio between Lyman-a1 and -a2 was measured at electron energies of 10.6, 24.7, and 49.6 keV ~2.12, 4.96, and 9.96 in threshold units!. The linear polarization of Lyman-a1 was obtained by comparing the experimental intensity ratio at an observation angle of 90° with the total emission cross section ratio calculated by a simple collisional radiative model. The present results are compared with existing theoretical results.