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We perform spectroscopy on the optical dipole transitions 5s5p $^3$P$_2$ -5s$n$d $^3$D$_{1,2,3}$, $n \in (5,6)$, for all stable isotopes of atomicstrontium. We develop a new spectroscopy scheme, in which atoms in themetastable $^3$P$_2$ state are stored in a reservoir before being probed. Themethod presented here increases the attained precision and accuracy by twoorders of magnitude compared to similar experiments performed in amagneto-optical trap or discharge. We show how the state distribution andvelocity spread of atoms in the reservoir can be tailored to increase thespectroscopy performance. The absolute transition frequencies are measured withan accuracy of 2 MHz. The isotope shifts are given to within 200 kHz. Wecalculate the $A$ and $Q$ parameters for the hyperfine structure of thefermionic isotope at the MHz-level. Furthermore, we investigate the branchingratios of the $^3$D$_{J}$ states into the $^3$P$_{J}$ states and discussimmediate implications on schemes of optical pumping and fluorescencedetection.

Reservoir spectroscopy of 5s5p $^3$P$_2$ - 5s$n$d $^3$D$_{1,2,3}$ transitions in strontium