We report measurements of the branching fraction, hyperfine constant, and second-order Zeeman coefficient of the $D_{5/2}$ level in ${}^{171}\mathrm{Yb}^{+}$ with up to a two-orders-of-magnitude reduction in uncertainty compared to previously reported values. We estimate the electric quadrupole reduced matrix element of the $S_{1/2}\leftrightarrow D_{5/2}$ transition to be 12.5(4) $e{a}_0^2$. Furthermore, we determine the transition frequency of the $F_{7/2}\leftrightarrow {}^{1}D{[3/2]}_{3/2}$ at 760 nm with a $\sim$25-fold improvement in uncertainty. These measurements provide benchmarks for quantum-many-body atomic-physics calculations and provide valuable data for efforts to improve quantum information processors based on ${}^{171}{\text{Yb}}^{+}$.

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• Atomic & molecular processes in external fields
• Atomic spectra
• Atomic, optical & lattice clocks
• Electronic structure of atoms & molecules
• Electronic transitions
• Fine & hyperfine structure