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We report the measurement of the photoionization cross sections of the5S${}_{1/2}$ and 5P${}_{3/2}$ states of ${}^{87}$Rb in a two-species Hg and Rbmagneto-optical trap (MOT) by the cooling laser for Hg. The photoionizationcross sections of Rb in the 5S${}_{1/2}$ and 5P${}_{3/2}$ states at 253.7~nmare determined to be $1^{+4.3}_{-1}\times10^{-20}~\text{cm}^2$ and$4.63(30)\times 10^{-18}\text{cm}^2$, respectively. To measure the 5S${}_{1/2}$and 5P${}_{3/2}$ states fractions in the MOT we detected photoionization rateof the 5P${}_{3/2}$ state by an additional 401.5~nm laser. The photoionizationcross section of Rb in the 5P${}_{3/2}$ state at 401.5~nm is determined to be$\text{1.18(10)}\times10^{-17}~\text{cm}^2$.

Photoionization cross sections of the 5S${}_{1/2}$ and 5P${}_{3/2}$ states of Rb in simultaneous magneto-optical trapping of Rb and Hg