\begin{table}%t1
\caption{\label{posizione bande}Band positions of solid methyl formate deposited at 16~K and their assignments.}
%%\centering

\par
\begin{tabular}{cccc}
\hline\hline \noalign{\smallskip}
   \multicolumn{2}{c}{Band position} & Assignment & Characterization \\
   cm$^{-1}$ & $\mu$m \\
   \hline
   3038 &  3.29  & $\nu_1$    & CH$_3$ str    \\
   3010 &  3.32  & $\nu_2$, $\nu_{13}$    & CH$_3$ str    \\
   2960 &  3.38  & $\nu_3$    & CH str        \\
   1720 &  5.81  & $\nu_4$    & C=O str       \\
   1450 &  6.90  & $\nu_6$    &  CH$_3$ def   \\
   1435 &  6.97  & $\nu_{14}$ & CH$_3$ def    \\
   1383 &  7.23  & $\nu_7$    & CH bend       \\
   1210 &  8.26  & $\nu_8$    & C--O str      \\
   1164 &  8.59  & $\nu_9$    & CH$_3$ rock   \\
   910  &  10.99 & $\nu_{10}$ & O--CH$_3$ str \\
   768  &  13.02 & $\nu_{11}$ & OCO def       \\
\hline
\end{tabular}
\end{table}