Lifetimes and Oscillator Strengths for Ultraviolet Transitions in Sn~{\sc ii}

In order to understand the atomic structure for atomic ions, experimental lifetimes are necessary to confirm theoretical predictions. Also, interpreting astronomical observations of atomic ions requires knowledge of their oscillator strengths and transition rates. We present the results of lifetime measurements taken with the Toledo Heavy-Ion Accelerator using beam-foil techniques on levels of interest in Sn~{\sc ii} producing lines at 1811.2 {\AA} and 1699.4 {\AA} ($5s5p^{2}$ \ $^{2}D_{5/2}$ and $5s5p^{2}$ \ $^{2}D_{3/2}$, respectively). Oscillator strengths are derived from the lifetimes, and our experimental results will be compared with our MCDHF calculations using the development version\footnote[2]{P. J{\"{o}}nsson et al., The Computational Atomic Structure Group (2014)} of the GRASP2K package\footnote[3]{P. J{\"{o}}nsson et al., Comput. Phys. Commun. 184, 2197 (2013)} as well as the latest calculations done by others.