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Alpha decays in the EXO-200 detector are used to measure the fraction ofcharged $^{218}\mathrm{Po}$ and $^{214}\mathrm{Bi}$ daughters created fromalpha and beta decays, respectively. $^{222}\mathrm{Rn}$ alpha decays in liquidxenon (LXe) are found to produce $^{218}\mathrm{Po}^{+}$ ions $50.3 \pm 3.0\%$of the time, while the remainder of the $^{218}\mathrm{Po}$ atoms are neutral.The fraction of $^{214}\mathrm{Bi}^{+}$ from $^{214}\mathrm{Pb}$ beta decays inLXe is found to be $76.4 \pm 5.7\%$, inferred from the relative rates of$^{218}\mathrm{Po}$ and $^{214}\mathrm{Po}$ alpha decays in the LXe. Theaverage velocity of $^{218}\mathrm{Po}$ ions is observed to decrease for longerdrift times. Initially the ions have a mobility of $0.390 \pm0.006~\mathrm{cm}^2/(\mathrm{kV}~\mathrm{s})$, and at long drift times themobility is $0.219 \pm 0.004~\mathrm{cm}^2/(\mathrm{kV}~\mathrm{s})$. Timeconstants associated with the change in mobility during drift of the$^{218}\mathrm{Po}^{+}$ ions are found to be proportional to the electronlifetime in the LXe.

Measurements of the ion fraction and mobility of alpha and beta decay products in liquid xenon using EXO-200