Abstract
Lyman-$\ensuremath{\alpha}$ lines of hydrogenlike ${\mathrm{Ti}}^{21+}$ have been observed with an electron-beam ion trap. The intensity ratio between Lyman-${\ensuremath{\alpha}}_{1}$ and -${\ensuremath{\alpha}}_{2}$ 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-${\ensuremath{\alpha}}_{1}$ was obtained by comparing the experimental intensity ratio at an observation angle of $90\ifmmode^\circ\else\textdegree\fi{}$ with the total emission cross section ratio calculated by a simple collisional radiative model. The present results are compared with existing theoretical results.
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