Electron shakeoff following the ${\beta }^{+}$ decay of trapped ${}^{35}$Ar${}^{+}$ ions

The electron shakeoff of ${}^{35}$Cl atoms resulting from the $\beta$${}^{+}$ decay of ${}^{35}$Ar${}^{+}$ ions has been investigated using a Paul trap coupled to a recoil-ion spectrometer. The charge-state distribution of the recoiling daughter nuclei is compared to theoretical calculations accounting for shakeoff and Auger processes. The calculations are in excellent agreement with the experimental results and enable one to identify the ionization reaction routes leading to the formation of all charge states.

Figure 1

Top view of the experimental setup. The inset shows the structure of the six stainless-steel rings of the Paul trap. See text for details.

Figure 2

(a) Experimental (black line) and simulated TOF spectra associated with the different charge states (gray lines); vertical dashed lines indicate the ranges of integration used to obtain the charge-state branching ratios. (b) Charge collected from the MCPPSD for different recoil-ion charge states (black lines) adjusted with gaussians (gray lines); the vertical dashed line indicates the cut due to electronic threshold.