Measurements of electric quadrupole transition frequencies in ${}^{226}$Ra${}^{+}$

We report the first driving of the $7s{}^2{S}_{1\mathrm{/}2}\to 6d{}^2{D}_{3\mathrm{/}2}$ and $7s{}^2{S}_{1\mathrm{/}2}\to 6d{}^2{D}_{5\mathrm{/}2}$ electric quadrupole (E2) transitions in Ra${}^{+}$. We measure the frequencies of both E2 transitions, and two other low-lying transitions in ${}^{226}$Ra${}^{+}$ that are important for controlling the radium ion’s motional and internal states: $6d
^2D_{3/2}\rightarrow 7p\ ^2P_{3/2}^{0}$and$6d\ ^2D_{5/2}\rightarrow 7p
^2P_{3/2}^{0}$.