Abstract
Natural radiative lifetimes have been determined in the determined in the $3\mathrm{sns} ^{1}S_{0} (n=4\ensuremath{-}15)$ and the $3\mathrm{snd} ^{1}D_{2} (n=3\ensuremath{-}15)$ sequences of Mg I employing a pulsed-laser system. The radiative lifetimes in the $^{1}S_{0}$ sequence and of the higher members in the $^{1}D_{2}$ sequence are unperturbed and scale as ${({n}^{*})}^{2.6}$ (where ${n}^{*}$ is the effective principal quantum number), while the lifetimes of the lower members in the $^{1}D_{2}$ sequence are perturbed by the doubly excited $3{p}^{2}$ configuration. The measured lifetimes are compared with available theoretical calculations, and a very good agreement is obtained.
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