\begin{table}%t2
\caption{Experimental radiative lifetimes in Ir~II.\label{irlifetimes}}
%\centerline
{
\begin{tabular}{lrcccr}
\hline \hline 
\multicolumn{2}{c}{Level$^a$} 	& Energy     		& $\lambda_{{\rm exc}}^b$		& $\lambda_{{\rm obs}}^c$ 	& \multicolumn{1}{c}{Lifetime}	\\
          		&	& (cm$^{-1}$)	   	& (\AA)             		& (\AA)             	& \multicolumn{1}{c}{(ns)}			      	\\
\hline
\parent{4}{F}6p \hspace{-3mm}	&z\ls{5}{D}{4}	&44~575.66	 	& 2512.6        & 2242.7	   	& 5.4(4)		\\
\parent{4}{F}6p \hspace{-3mm}	&z\ls{5}{F}{5}	&47~003.98		& 2126.8	& 2362.6		& 4.4(3)		\\
\parent{5}{D}6sp\hspace{-3mm} 	&z\ls{7}{D}{4}	&50~301.96		& 2081.0	& 2196.4		& 34(3)		\\
\parent{4}{F}6p \hspace{-3mm}	&z\ls{5}{D}{3}	&51~226.62	 	& 2076.8	& 2152.7		& 4.8(4)		\\
\parent{5}{D}6sp\hspace{-3mm} 	&z\ls{7}{D}{5}	&51~333.01	 	& 2147.8	& 3118.8		& 52.0(5)			\\
\parent{4}{F}6p \hspace{-3mm} 	&z\ls{5}{F}{2}	&51~371.96		& 2314.9	& 2586.1		& 6.6(5)		\\
\parent{4}{F}6p \hspace{-3mm} 	&z\ls{5}{F}{1}	&51~978.21		& 2044.8	& 2300.9		& 5.3(4)		\\ 
\parent{4}{F}6p \hspace{-3mm} 	&z\ls{3}{D}{2}	&52~510.10		& 2300.9	& 2714.1		& 6.5(4)		\\
\parent{4}{F}6p \hspace{-3mm} 	&z\ls{5}{G}{3}	&53~196.31		& 2065.1	& 2793.8		& 8.0(5)		\\
\hline
\end{tabular}} 
\medskip
$^a$ $LS$ level notation based upon \citet{Kleef78}. \\
$^b$ Laser wavelength used to populate the upper state. \\
$^c$ Wavelength used to detect the fluorescence signal. 
\end{table}