\begin{table}%t5
\par
\caption {Vertical excitation energies (in eV) and dominant electron configuration of the lowest electronic 
 states of $\textit{l}$-SiCCC. These energies are given with respect to the $X^3$ $\Sigma^{-}$ ground 
state.
\label{tab5}}
%\centerline
 {\begin{tabular}{c c c c c}
\hline \hline
State & CASSCF/cc-pVT$Z^a$ & MRCI+Q/cc-pVT$Z^b$ & MCQDP$T^c$ & Electron configuration \\
\hline
$ X^3 \Sigma^- $ &
0.0 &
0.0 &
0.0 &
$ (11 \sigma)^2 (2 \pi)^4 (3 \pi)^2 $
\\
$ {}^1 \Delta $ &
0.30 &
0.29 &
0.40 &
$ (11 \sigma)^2 (2 \pi)^4 (3 \pi)^2 $
\\
$ {}^1 \Sigma^+ $ &
0.44 &
0.46 &
0.46 &
$ (11 \sigma)^2 (2 \pi)^4 (3 \pi)^2 $
\\
$ {}^1 \Sigma^- $ &
2.10 &
2.20 & &
$ (11 \sigma)^2 (2 \pi)^4 (3 \pi)^1 (4 \pi)^1 $
\\
$ {}^3 \Delta $ &
2.16 &
2.29 & &
$ (11 \sigma)^2 (2 \pi)^4 (3 \pi)^1 (4 \pi)^1 $
\\
$ {}^3 \Sigma^+ $ &
2.17 &
2.35 & &
$ (11 \sigma)^2 (2 \pi)^4 (3 \pi)^1 (4 \pi)^1 $
\\
$ {}^3 \Pi $ &
2.42 &
2.50 & &
$ (11 \sigma)^1 (2 \pi)^4 (3 \pi)^3 $
\\
$ {}^1 \Pi $ &
3.61 &
3.22 & &
$ (11 \sigma)^1 (2 \pi)^4 (3 \pi)^3 $
\\
$ {}^5 \Pi $ &
3.44 &
3.80 & &
$ (11 \sigma)^1 (2 \pi)^4 (3 \pi)^2 (4 \pi)^1 $
\\
$ {}^3 \Pi $ &
4.70 & 
4.53 & &
$ (11 \sigma)^1 (2 \pi)^4 (3 \pi)^2 (4 \pi)^1 $
\\
$ {}^5 \Sigma^- $ &
4.54 &
4.78 & &
$ (11 \sigma)^2 (2 \pi)^3 (3 \pi)^2 (4 \pi)^1 $
\\
$ {}^5 \Delta $ &
4.67 &
4.92 & &
$ (11 \sigma)^2 (2 \pi)^3 (3 \pi)^2 (4 \pi)^1 $
\\
$ {}^5 \Sigma^+ $ & 
4.77 & 
5.02 & &
$ (11 \sigma)^2 (2 \pi)^3 (3 \pi)^2 (4 \pi)^1 $
\\
$ {}^1 \Pi $ &
5.77 &
5.63 & &
$ (11 \sigma)^1 (2 \pi)^4 (3 \pi)^3 $
\\
$ {}^5 \Pi $ &
6.01 &
6.34 & &
$ (11 \sigma)^1 (2 \pi)^3 (3 \pi)^3 (4 \pi)^1 $
\\  
\hline
\end{tabular}}
\par
\smallskip
$^a$ $E$(CASSCF/cc-pVTZ) = --402.4642666 $E_{\rm h}$;
$^b$ $E$(MRCI+Q/cc-pVTZ) = --402.896849 $E_{\rm h}$;
$^c$ (MCQDPT/aug-cc-pVDZ) \citep{10}.
\end{table}