\begin{table}%[htdp]%t1
\par
\caption{\label{default}Carbon dioxide: gas, pure solid, hydrate, and clathrate hydrate transitions.}
%\centerline
{
$$
\begin{tabular}{l l l l l l}
\hline\hline
& Gas $\rm^{e}$ & Crystal $\rm^{a}$    & Hydrate $\rm^{b}$ & &Clathrate $\rm^{c}$\\
Assigned						& &  (4-21K)   & (15K) & & (5.6K) \\
transitions  & &  CO$_2$   & H$_2$O/CO$_2=5$ & & Type I \\
&$\bar{\nu}$ (cm$^{-1}$)      &$\bar{\nu}$ (cm$^{-1}$)      &$\bar{\nu}$ (cm$^{-1}$)   & &$\bar{\nu}$ (cm$^{-1}$)\\
\hline					
$\rm \nu_3(^{13}CO_2)$						&2283.488	&2282.6	&2278 	&\multirow{2}{*}{\Large\{} &2271.3 	\\
& 		& 	&2280.2 	\\
$\rm \nu_3(^{18}OCO)$						&2332.113		&--	&--          &\multirow{2}{*}{\Large\{} &2319.5  \\
&	&	& 		& 	&\it{2330} 	\\
$\rm \nu_3$ $\rm^{d}$						&2349.143	&2343.1	&2341 	&\multirow{2}{*}{\Large\{} &2335 	\\
&	&	& 		& 	&	2347 	\\
\hline					
First Fermi resonance &	& & &&\\
\hline					
$\rm\nu_1+\nu_3\;_{FR2} (^{13}CO_2) ^{e}$		&3527.737	&3514		&		&	&\it{exp. at $\sim$3505} 	\\
$\rm\nu_1+\nu_3\; _{FR2} (^{18}OCO) ^{e}$		&3571.141	&3563		&		&	&\it{3550} 	\\
$\rm\nu_1+\nu_3\;_{FR2}$					&3612.842	&3599.1	&3592		&\multirow{2}{*}{\Large\{}&3589.7 	\\
&	&	&		&	&3596 	\\
$\rm\nu_1+\nu_3\;_{FR1} (^{13}CO_2) ^{e}$		&3632.911	&3632.4	&		&	&\it{3613}	\\
$\rm\nu_1+\nu_3\;_{FR1} (^{18}OCO) ^{e}$		&3675.134	&3667.3	&		&	&\it{3651.9} 	\\
$\rm\nu_1+\nu_3\;_{FR1}$					&3714.783	&3708.0	&3702	 	&\multirow{2}{*}{\Large\{} &3692.7\\
&	&    	&           & 	& 3703.4\\
\hline
First $\nu_3$ overtone &	& & &&\\
\hline 
$\rm 2\nu_3$ 						&	&		&4678		&	&-- \\	
\hline
Second Fermi resonance &	& & &&\\
\hline					
$\rm 2\nu_1+\nu_3\;_{FR3}$					&4853.623	&4830.5	&4827		&\multirow{2}{*}{\Large\{}&4819.7 	\\
&	&	&		&	&\it{4825.6}   \\
$\rm 2\nu_1+\nu_3\;_{FR2}$					&4977.835	&4971.2	&4962		&\multirow{2}{*}{\Large\{}&4950.2 	\\
&	&	&		&	&4962.2   \\
$\rm 2\nu_1+\nu_3\;_{FR1}$					&5099.660	&5086.6	&5083		&\multirow{2}{*}{\Large\{}&5066.2 	\\
&	&	&		&	&\it{5075.3}   \\
\hline
\end{tabular}$$}
\par
\medskip
$\rm^{a}$ Mid-infrared :  pure CO$_2$ spectrum measured at 4~K in April 1996 with the same spectrometer; Near-infrared spectra at 21~K and assignments from Quirico \& Schmitt (\cite{Quirico1997}); $^{\rm b}$ from Bernstein et~al. (\cite{Bernstein2005}); $^{\rm c}$ position accuracy is estimated to better than 0.5~cm$^{-1}$, line positions in italics have higher uncertainties due to line blending, weakness, or saturation effects; $\rm^{d}$ clathrate antisymmetric stretching-mode assignments for the $\rm \nu_3(^{12}CO_2)$ based on Fleyfel \& Devlin (\cite{Fleyfel1991}); $^{\rm e}$ transitions are assigned based on Rothman (\cite{Rothman1986}).
\end{table}