Hyperfine-induced depolarization effect in the X-ray line emission $$\mathrm {1s2p\,^3P_2\!\rightarrow \!1s^2\,^1S_0}$$ of He-like ions

Hyperfine-induced effects on Kα1 linear polarization following electron-impact excitation of heliumlike Tl79+ ions with nuclear spin I=1/2

“…In the past decades and especially after the first polarization measurements for x-ray lines of heliumlike Sc 19+ ions [41], which demonstrated that high-precision polarization measurements can be used to study the hyperfine interaction in highly charged ions, many studies were performed for exploring hyperfine-induced effects on angular and polarization properties of x-ray lines [42][43][44][45][46][47][48][49][50][51][52]. For example, Inal et al investigated the circular polarization of x-ray lines of Sc 19+ ions excited by impact with polarized electrons and found that it is drastically reduced due to the hyperfine interaction [43].…”

“…For example, Inal et al investigated the circular polarization of x-ray lines of Sc 19+ ions excited by impact with polarized electrons and found that it is drastically reduced due to the hyperfine interaction [43]. Bensaid et al studied the linear polarization of the magnetic-quadrupole (M2) line (1s2p 3 P 2 → 1s 2 1 S 0 ) following EIE of heliumlike ions [44,45]. It was discovered that the linear polarization is enhanced by the interference between the leading M2 and hyperfine-induced electric-dipole (E1) decay channels of the hyperfine-resolved 1s2p 3 P 2 , F i = 3/2 → 1s 2 1 S 0 , F f = 1/2 transition.…”